1 c. soft butter
1/2 c. sifted powdered sugar
1 egg
1 tsp. vanilla
2 1/2 c. cake flour
1 tsp. baking soda
1 tsp. cream of tartar
1/4 tsp. salt

Cream butter until fluffy. Add sugar gradually. Add unbeaten egg, vanilla. Stir in dry ingredients. Beat well. Drop by teaspoonful on greased baking sheet. Bake at 350 degrees for 15 minutes.