Sift together flour and baking powder. Cream butter, sugar and salt; add egg and vanilla. Beat flour into butter mixture. Add food coloring if desired. Press through cookie press with a star tip and place on a cold, ungreased cookie sheet. Bake 10-12 minutes in a 350-degree oven. Makes 45 cookies. These are especially pretty on a buffet if you can use a 3-tiered serving dish, and decorate the cookies several different ways with colored sugars and tiny decorations.