The Unlikely Baker

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You Can Make Any Cake a Rainbow Cake

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You can make any cake a rainbow cake – you just need a basic white or yellow cake, lots of bowls, a little patience, and the colours of the rainbow. A happy disposition is recommended (but optional).

Rainbow Cake

Love for Toronto

Toronto is a remarkable city. If you haven’t been to visit, let me tell you, the things you hear about it are true – it’s clean, it’s safe, people are polite. It is such a welcoming city, too – no matter the colour of your skin, no matter your religion (or lack thereof), no matter your ethnicity or sexual orientation, Torontonians accept you for who you are.

Happy Pride!

In fact, we celebrate our diversity, it’s what makes our city unique. And this is most apparent during Pride Week. Pride used to be just about LGBTQ (and it still is) but it’s evolved to become even more inclusive. And it culminates in a Pride Parade where a million people are out on the streets, just being themselves, having a grand time.

Rainbow Cake

This year though, they’ve decided to make it Pride Month, starting today. And what better way to kick off celebrations than with cake? (Cake is always the answer). And what better cake to celebrate with than a rainbow cake?

Your favourite cake, rainbow-fied

Rainbow Cake

A rainbow cake looks intimidating (6 layers!) but it’s really just your favourite white or yellow cake (in my case, I used my favourite vanilla cake) that’s divided into 6 layers and tinted the colours of the rainbow. It takes time and patience but the end result is worth it.

Rainbow cake tips and tricks

You can’t just take any cake and tint it though. There are some things you need to keep in mind:

Rainbow Cake

  • Since this is going to be a 6-layer cake, the cake you pick has to be dense. Stay away from the soft and too moist cakes because after the 4th layer, your cake might not be able to support any more and either sink, sag or just collapse.
  • Pick a cake that has enough batter to be divided into 6. You want layers, not pancakes.
  • When dividing the batter, use a kitchen scale. You can eyeball it but do you really want to take the chance and end up with uneven layers? A kitchen scale is very useful here. You can get one for less than $20.
  • When dividing your batter, remember that there will be residue batter left on the bowl or the cup you’re using to transfer or the spatula you’re using to scrape. So if you have a total batter of 1300g / 6 = 216.67, don’t transfer exactly 216.67 to each bowl because you won’t have enough for your last one. Transfer a gram or two under to account for rogue batter.
  • If you don’t have enough pans, don’t be tempted to use different sizes and plop them into the oven all at once. And you can’t let the batter sit in the bowl waiting for the first batch to bake because the ingredients are reacting to one another more than they should. You’d need to divide the recipe and make only enough for the pans you have (i.e. if you only have 2 8-inch pans, you will have to divide the recipe into 3 so you’ll make it 3 times).
  • You need to use gel food colour. The liquid kind just won’t be vibrant enough and you’ll need to use a lot, which will put too much unnecessary liquid into your batter.
  • Once your cakes are baked, trim the top as well as the sides. Not only to ensure they are even, but also to ensure you get the burnt/brown spots out of there.

Rainbow cake frosting

Rainbow Cake

Now what to frost your cake with. I say pick your favourite frosting and go with it! White is always stunning with the rainbow colours but hey, it’s your rainbow cake and it’s all about celebrating who you are and what makes you happy. Just make sure you have enough frosting to frost between and all over your cake.

In my case, I used my go-to Swiss Meringue Buttercream and it went perfectly with my vanilla rainbow cake. It was delicious.

[clickToTweet tweet=”Brighten up someone’s day with this insanely happy rainbow cake!” quote=”Brighten up someone’s day with this insanely happy rainbow cake!”]

Step back and bask in the colours of the rainbow

Rainbow Cake

I know it looks like a lot of work but when you get into it, it’s really not that difficult. And the moment you cut into the cake and your exquisite layers look right back at you – take a moment and pat yourself in the back. Well done you.

So do your planning, bake this cake and wow your guests, birthday celebrant, yourself.

Print
You Can Make Any Cake a Rainbow Cake

Rainbow Cake

You can make any cake a rainbow cake – you just need a basic white or yellow cake, lots of bowls, a little patience, and the colours of the rainbow.

Ingredients

    For the Cake:
  • 3 cups all purpose flour
  • 1 tablespoon baking powder
  • 1/2 teaspoon salt
  • 4 large eggs, room temperature
  • 2 cups granulated sugar
  • 1 tablespoon vanilla extract
  • 3/4 cup canola oil
  • 1 1/4 cup milk, room temperature
  • Gel food colour - red, orange, yellow, green, blue and purple

Instructions

    For the Cake:
  1. Preheat oven to 350F and grease the sides and the bottoms of 6 8-inch pans (see my tips on what to do when you don't have 6 pans). Line the bottom with parchment paper for easy release. Set aside.
  2. In a medium bowl, combine 3 cups flour, 1 tablespoon baking powder and 1/2 teaspoon salt. Set aside.
  3. Using a handheld electric mixer or a stand mixer fitted with the paddle attachment, beat the 4 eggs, 2 cups sugar and 1 tablespoon vanilla until light and triple in volume (about 10 minutes). Start on low speed then gradually move up to medium-high speed. Drizzle the 3/4 cup canola oil while beating.
  4. Switch to low speed and add a third of your flour then half your milk. Another third of your flour, the rest of your milk and finally the rest of your flour. Make sure each addition is incorporated well. Beat the batter until smooth (about 5 minutes).
  5. Weigh your batter and divide the total weight into 6. Transfer the corresponding weight into separate bowls (see my tips on how to correctly divide and transfer the batter). Tint each bowl in red, orange, yellow, green, blue and purple. Then transfer into prepared pans and bake for 20 minutes (see notes) or until a toothpick inserted in the middle comes out clean or with minimal crumbs.
  6. Let cool in the pans for 10 minutes before transferring to a rack to cool completely.
    For the Frosting:
  1. See Swiss Meringue Buttercream
    For the Assembly:
  1. Trim the tops of the cake to ensure they are level. Also trim the sides to remove any burnt spots. The important thing to remember is all your cakes must be of equal width and height.
  2. Put the purple cake on a cake turntable first and evenly spread frosting on top. Do the same for the blue, green, yellow, orange and red layers. Then proceed to cover the rest of the cake with frosting and decorate as desired.

Notes

You can also use 6 6-inch pans. Just remember that you will end up with a smaller width cake but thicker layers, and therefore a taller cake.

If you have 6 pans, they won't all fit on the middle oven rack position. So at 10 minutes, switch the bottom pans with the top pans for an even bake.

You can cook the cakes the day before and make the frosting the day you're serving the cake. Just leave the cakes on the counter and loosely cover with a tea towel.

You'll notice that my red layer is more pink/coral than red. I used the red gel colour but it turned pink. Any tips?

https://theunlikelybaker.com/rainbow-cake/

(Vanilla cake recipe adapted from Ricardo).

Happy baking! (And Happy Pride Toronto!)

Did you make this rainbow cake? Tell me about it in the comments section below. I’d love to hear all about it.

Want another fun cake? Check out this Funfetti Cake.

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Reader Interactions

Comments

  1. I’ve noticed that when using darker food colorings it’s easier to add the color to the butter before mixing everything. But for a cake like this I would suggest using a more concentrated/deeper shade of red.

    Reply

    • Adding it to the butter is an interesting idea. I’ve never tried it…will it change the chemistry of the butter (e.g. the way it reacts to sugar when creaming) in any way?

      Reply

    • personally, I find that when it comes to darker colors like Red put about 1/4 table spoon’s cocoa powder in. It makes the darker colors pop a bit but the darker tint helps the cake its self not look pink. For this recipe, I would also make the purple with a bit of “CP” in it so it helps with the flavor of the cake all together. I would do it so the red cake wouldn’t be the only chocolate cake.

      Reply

  2. Thanks for the recipe, I’m making it for my youngest child’s 3rd birthday. I think with red food coloring, even the gel, you just have to use way more than you really want to or think necessary. You might also consider using a white cake as the base recipe rather than yellow, the yellow from the egg yolks might have an impact on the final colors.

    Reply

    • Hi Sarah! I was just talking to my local baking supplies store about red food colour last Saturday! I was telling them how I cannot for the life of me get anything to turn Christmas red (who wants to receive fuchsia Christmas cookies LOL!). They explained that with butter based anything, it is almost impossible so using a white cake is a smart move. They did recommend I try using powdered food colour next time instead of gel. I haven’t tried yet though. Have you? PS: Happy birthday to your little one!

      Reply

  3. This looks gorgeous and i’m hoping to give it a go as I need to make an Olympic themed ‘showstopper’ for a work bakeoff. I want to keep things simple and stick with your swiss mergingue buttercream – do you have a sense of how many batches of that I would need to make in order to assemble and cover the cake?

    Also – I plan to bake on Sunday and hopefully assemble on Monday – will it hold up to take into work on a Tuesday? I assume so but not sure if the color from the cakes bleeds at all or how well the frosting will hold up?

    Reply

    • Hi Meg! I used Swiss Meringue Buttercream here too. I have a recipe on my blog and that yields about 4 cups and it was enough. I didn’t do any sort of decoration though, just the layers, the crumb coat and the final coat so if you’re thinking of doing like flowers on top or on the sides, you may need to do 1.5 of the frosting recipe.

      Are you planning to make the buttercream the day you assemble it? That would be my suggestion. And yes the cake should stay in place. You can put it in the fridge once it’s frosted if you like and just keep at room temp about 20 mins before you’re serving it.

      The colours of the cake here don’t bleed even days after assembly. I used gel food colour. Good luck with the bake off!!

      Reply

  4. I love this PRIDE cake! How gorgeous. I should try a layered cake one day… I usually stick with layered smoothies haha

    Reply

    • Hi Dylan! Thank you 🙂 I on the other hand should really have more layered smoothies haha! Hope you’re having a wonderful weekend!

      Reply

  6. It looks so delicious! I feel like putting my hands inside my laptop and grabbing it right now! Have pinned it for my reference.

    Reply

  7. What a beautiful cake! The colors are just stunning. My daughter would love this for her next birthday.

    Reply

    • Thanks Sara! Make sure to use the gel food colour instead of the liquid ones to get the vibrant colours. Hope your daughter loves it! 🙂

      Reply

  10. Very nice! I love the way you’ve really made rainbow cake accessible and do-able, instead of just posting a bunch of (admittedly gorgeous) cake photos.

    Oh and I’ve never lived in Toronto, but I love it too. I’ve never understood the haters. 🙂

    Reply

    • What haters? Ha ha 🙂 Thanks Sean! I tried to make it as detailed as possible so everyone can recreate it 🙂

      Reply

    • I must admit layer cakes can really be daunting but organization is key to a stress-free kitchen 🙂 Hope you give it a shot!

      Reply

  12. Yesssss, Jolina! This is a fantastic post. Great tip about using dense cake—I would’ve forgotten entirely and had a collapsed rainbow mess on my hands. Love that you made this for Pride Month too! 🙂

    Reply

    • Thanks Cassie! That’s lovely coming from you, you’re an awesome baker! And I just thought Pride = rainbow = rainbow cake 🙂

      Reply

  13. This looks so good :0 it belongs on pintrest and in my stomach .my older sisters birthdays coming up in going to “try” to do this .hopefull it’ll come out right

    Reply

    • Hi Gemima! Thanks for pinning! And your sister is very lucky – she is about to receive a really awesome birthday cake 🙂 Let me know how it goes!

      Reply

    • Thanks Sophie! I promise it’s not difficult, just more steps than your usual cake 🙂 So planning ahead is really key here. Hope you give it a shot!

      Reply

    • An ombre version would look gorgeous! You must share a picture of the final product! 🙂 Can’t wait to see. Thanks Chloe!

      Reply

  16. I had the fortune of staying in Toronto for a over a month and fell in love with it. It is a very inclusive and embracing city and wish I could live there long term!

    Reply

    • Hi Agatha! I do feel homesick a lot but living in Toronto helps counter that – it really is a lovely city 🙂 Winter I don’t care for so much (ha ha) but the summers are just stunning.

      Reply

    • Thanks Marisa! It’s the gel food colour, it really makes a big difference. Hope you get to try to make one – maybe the next birthday that comes up 🙂

      Reply

  18. Happy Pride Month! What a beautiful way to celebrate, this cake is GORGEOUS. I love your tips – I never thought of measuring them out so they weigh slightly less to account for the extra batter, brilliant!

    Reply

  19. Happy Pride! When I saw your cake, I didn’t even think of a rainbow cake for that reason, but it is so fitting. I love the vibrant colours of your cake. Nice to know it isn’t as hard as one would think to make.

    Reply

    • Hi Janet! Happy Pride! I was surprised too. It wasn’t as difficult as I expected; just more steps than usual 🙂 Hope you get to try making one sometime.

      Reply

  20. Your tips are valuable. It’s been a long time I wanted to make rainbow cake but I don’t really dare to make it because all those layers. Thanks for sharing the tips.

    Reply

    • Hi Rose! You are most welcome. All those layers are intimidating TBH but if you plan ahead and manage your time you’ll do great 🙂

      Reply

  23. I love this cake! It is soooo beautiful! The colors look so vibrant and the layers are very even. You did an amazing job!
    I’m happy to hear that Toronto is such clean and friendly city 🙂 I cannot wait to see it for myself in a bit over a month!

    Reply

    • Thanks Natanja! You’re an awesome baker and you bake stunning cakes so I really appreciate it 🙂 And yes, I’m excited for your trip! Wee!

      Reply

  27. I bet it tastes as good as it looks. The pride cake is amazing but your photos are off the chart. Great job with this post. I couldn’t wait to read and see more.

    Reply

    • It actually does taste delicious. It’s a vanilla cake with a vanilla frosting and it’s just lovely 🙂 Thanks for your comment on the photos, too! Appreciate it 🙂

      Reply

  30. Mmmmm-mmmmm-mmmmm!!!! I think I’ve just found my next birthday cake as your rainbow cake looks amazing!!!! And great instructions too so it looks do-able! And I have a month to practice….now then, where’s my apron….?!! Great post, thanks for sharing!

    Reply

    • Awesome! I’m excited for you Liz! Let me know how it goes (but just in case things get lost in cyberspace – I wish you a very happy birthday!)

      Reply

  31. These are so pretty! I love how in the pictures. You show Hers and Hers mugs! My wife and I have thought about moving to Canada. The U.S. is getting more and more scary. Violence is getting way out of hand here. Maybe once it was a great nation. But now it is more like the ghetto side of town that you avoid….

    Reply

    • Thanks very much JT! I got those mugs at a huge discount too 🙂 Sorry to hear about the violence. Toronto has crime too don’t get me wrong – I guess there’s crime anywhere. We all just really need to be smart and careful these days eh? It’s not the world our parents grew up in that’s for sure.

      Reply

    • Thanks Ana! There are some bad apples as with any city but generally people are nice and welcoming 🙂 Happy Pride!

      Reply

    • Thanks Kate! Try keeping the layers a secret then watch their faces when they see the rainbow inside. FUN! 🙂

      Reply

  37. Oh my gosh this is so amazing! I would love to attempt this! Unfortunately, I lack the patience needed to make this! Haha. Perhaps on a special occasion I could muster up the patience to make such a beautiful cake! Thanks for sharing!

    Reply

    • Believe me Megan, patience is NOT one of my virtues either haha. So if I can do it anybody can! Just a little planning and organization and you’re set. Let me know when you get the chance to attempt it! 🙂

      Reply

    • Oh my gosh Lainey really? Thanks!!! I kind of messed up the frosting outside so I opted for a “rustic” look haha. Someday I will get really sharp and smooth edges…

      Reply

    • Thanks very much Liz! Putting sprinkles in the rainbow cake will be an eruption of colours like you’ve never seen before. Your kitchen (and you) will never be the same lol! Cannot wait to see what you come up with 🙂

      Reply

    • Hahahahaha yes, our dishwasher was overflowing with bowls of different sizes. It’s a small price to pay though 🙂 Hope you try it! 🙂

      Reply

    • Thanks Georgina! I used gel food colour – you only need very little to get vibrant colours like that. And isn’t Swiss Buttercream just a dream to frost with? 🙂

      Reply

  45. No idea how to make it red but it looks perfect! Rainbow cake is on my to do list forever. I love Toronto beautiful city and foodies heaven.

    Reply

    • Hi Suchi! I had the same problem last Christmas. I gave away Christmas cupcakes that had fuchsia frosting haha. I don’t know why red does not like me! Hope you can visit Toronto; it is a great place for foodies 🙂

      Reply

  46. You make this look so easy!! Your cake making skills are definitely something I aspire to – I’m FAR from making any layered cake in general! This is simply gorgeous!

    Reply

  48. I have ALWAYS wanted to make (and eat!) one of these rainbow cakes, you’ve made it sound so easy, I think I’ll finally give it a go — what a wonderful surprise to cut into the pure white cake and see the stripes 🙂

    Reply

    • Hi Sue! It’s really not as difficult as it looks – just lots of planning and organization 🙂 I’m excited for you! Let me know how it goes 🙂

      Reply

  50. Oh I do love the idea of a rainbow cake, but they are often so less well executed than this one – which is gorgeous! What a brilliant and informative post too, packed full of great hints and tips 😀

    Reply

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