1 1/2 c. powdered sugar
2 sticks butter
1 tsp. baking soda
1/2 tsp. cream of tartar
1 egg
2 tsp. vanilla
2 1/2 c. flour

Refrigerate until dough is set; roll out on floured surface. Bake at 350 degrees for 6-7 minutes until light brown. Use ungreased cookie sheet.