In a large bowl, whisk flour, baking soda, salt, cornstarch, cocoa powder and Ovaltine until combined.
2½ cups all purpose flour, 2 tsp baking soda, 1 tsp salt, 2 tbsp cornstarch, ½ cup cocoa powder, ¾ cup chocolate malted milk powder
In another bowl using an electric mixer or using a stand mixer with the paddle attachment, cream butter, brown sugar and white sugar on medium-high speed until light and fluffy (about 3 minutes).
1 cup unsalted butter, 1 cup brown sugar, ½ cup granulated sugar
Add eggs and vanilla extract. Stir until incorporated.
2 pieces large eggs, 2 tsp vanilla extract
Switch mixer to low-medium speed and add your flour mixture in thirds, beating until incorporated. The batter will be thick and sticky so remember to regularly scrape the bottom and sides of your bowl.
Add in chopped Maltesers and stir until evenly blended.
2½ cups chocolate malted milk balls
Chill the dough for at least an hour.
When ready, preheat your oven to 350F.
Scoop the cookie dough into a cookie sheet or baking pan lined with parchment paper, making sure to give at least an inch of space around each cookie.
Bake for 10 minutes or until the cookies turn matte and the edges start to set and firm up.
Remove from oven, allow to rest in the pan for a few minutes before transferring to a wire rack to cool completely.
Video
Notes
For the yield, it depends on how big or small you scoop your cookie dough. I use a 2-tbsp medium cookie scoop and get 36 cookies. That is the basis for the estimated nutrition information provided.
In the ingredients section, I provide the exact brands of the malted chocolate powder and malted milk balls I use. You can use similar products, just note that the sweetness and flavor profile will vary.
See post for more baking tips, FAQs and step-by-step photos.