Perfect Peppermint Patties

1 box (1 pound) powdered sugar

3 T butter or margarine, softened

2 t peppermint extract

½ t vanilla

¼ C evaporated milk

2 C (12 oz.) semi-sweet chocolate chips

2 T shortening

In a bowl, combine first four ingredients. Add milk and mix well. Roll into 1” balls and place on a waxed paper-lined cookie sheet. Chill for 20 minutes. Flatten with a glass to ¼”; chill for 30 minutes. In a double boiler or microwave-safe bowl, melt chocolate chips and shortening. Dip patties; place on waxed paper to harden. Yield: about 5 dozen