Preheat oven to 425°
Combine and mix all dry ingredients (flour, corn starch, baking powder, baking soda, sugar, salt)
Use hands to add in butter into dry mixture
Add 3/4 cup buttermilk, mix in with spatula. Mixture can be lumpy.
With floured hands, make balls with mixture and move to a non-stick baking sheet (each ball should be slightly larger than a golf ball).
Bake 13-15 minutes