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

Cream sugar and butter; add egg yolks and vanilla. Sift dry ingredients together. Add to creamed mixture. Pinch off dough and roll walnut-size pieces. Roll in granulated sugar. Place on greased cookie sheets. Bake until set, not brown. Bake at 350 degrees for 10-12 minutes, depending on oven.