1 cup butter, softened
3 egg yolks, beaten
2-1/2 cups flour
1 tsp baking powder
1-1/4 cups sugar
1 tsp vanilla extract
1/2 tsp cream of tartar

Lightly grease cookie sheet. Preheat the oven to 350 degrees. Cream butter and sugar together until light and fluffy. Beat in the egg yolks and vanilla. Sift together dry ingredients; add to the batter and mix well. Make little balls of dough about walnut size. Place on cookie sheet but do not flatten. Bake for about 15 minutes or until lightly browned.
Makes about 3 dozen.