Jelly Cookies

3/4 lb. butter
1 c. sugar
4 c. flour
3 egg yolks
1 tsp. vanilla

Cream together butter and sugar. Add to above, flour, yolks and vanilla. Roll in a ball the size of a walnut and punch down in center. Pull small dab of jelly in center. Bake in 425 degree oven from 10 to 12 minutes. Yield: 3 dozen cookies.