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

Cream butter until fluffy. Add sugar slowly. Cream until fluffy. Add unbeaten egg and vanilla. Beat well. Add sifted dry ingredients. Chill dough. Roll out on well-floured board 1/8 inch thick. Bake 6 minutes at 400 degrees.