2 c. flour
1/2 lb. butter

Blend as for a pie crust.

1/2 c. sour cream
2 egg yolks
1 tsp. vanilla or flavoring of your choice

Blend with flour mixture. REFRIGERATE OVERNIGHT. Roll thin. Cut and twist. Bake on ungreased cookie sheet in 350 degree oven for 10-12 minutes. Sprinkle with powdered sugar.