Preheat oven to 400F. Lightly grease baking pan (I use 1 large cookie sheet, you may need to use 2 depending on how big your pan is) and set aside.
In a large bowl, combine 3 cups flour, 1/3 cup sugar, 1 teaspoon salt, 2 1/2 teaspoons baking powder and 1/2 teaspoon baking soda.
Add the 3/4 cup butter and cut with a pastry cutter or a fork until the mixture looks coarse (you should see pieces of butter/flour "balls" about the size of chickpeas).
Make a well in the middle and add 1 cup buttermilk. Mix until just combined. Don't over mix. Now is the time to add chocolate chips or other goodies, if using.
Transfer the dough to a floured surface and divide into 2 equal parts. Lightly knead each into 3/4 inch thick, 6-inch diameter rounds. Cut each round into 8 wedges and place on your prepared baking pans. Space them out evenly, about 2 inches apart.
Bake for 12-15 minutes or until lightly browned. Each oven is different and they brown pretty quickly so watch the oven (don't leave!).