Preheat oven to 350°F

In the mixer, cream butter, and sugar together until light. Add the flour slowly until mixed. Then add the cornstarch until mixed; add the vanilla extract and blend

Place the mix into a piping bag with a star tip and pipe the mixture out into rosettes on a baking sheet

Place in the oven and bake at 350°F for 10-12 minutes or until light beige. Let stand for 10 minutes or until cool before removing them