1/2 c. butter
1 c. sugar
2 eggs
1 tsp. vanilla
3 1/2 c. sifted flour
1 tsp. baking powder
1/2 tsp. salt
1/2 c. sour cream

Cream butter and sugar until light and fluffy. Blend in eggs and vanilla. Add combined dry ingredients. Alternate with sour cream. Mix well after each addition. Chill several hours or overnight.

On lightly floured surface, roll out dough 1/4 inch thickness. Place on ungreased cookie sheet. Sprinkle with sugar. Bake 450 degrees 10 to 12 minutes until lightly brown.