01 -
Beat butter and sugar for 3-4 minutes until very light. Add extract if using.
02 -
Mix in sifted flour and cornstarch just until combined.
03 -
Form into 36 equal balls, place on lined tray, press tops with fork, add sprinkles if using.
04 -
Refrigerate dough balls for 2 hours or freeze until firm.
05 -
Heat oven to 300°F and bake for 19-20 minutes until tops look set.
06 -
Let cookies cool completely on baking tray.