01 -
Whip butter and powdered sugar until it’s airy, about 3–4 minutes. Add flavoring if you’re using it.
02 -
Gently fold in cornstarch and flour until it just comes together.
03 -
Divide dough into 36 small pieces. Shape into balls, flatten with a fork on a lined tray, and throw on sprinkles if you'd like.
04 -
Place shaped dough in the fridge for 2 hours, or freeze it so it firms up.
05 -
Preheat oven to 300°F. Bake for 19–20 minutes, until the tops no longer look shiny.
06 -
Leave cookies on the tray to cool fully before moving them.