3 sticks butter
1 c. sugar
2 egg yolks
1 tsp. vanilla
3 1/2 c. all-purpose flour
2 egg whites

Cream butter, sugar; add egg yolks, vanilla. Add flour; mix well. Chill dough. Roll into 1 to 1 1/2 inch balls. Dent with thumb. Fill hole with jelly. Brush with beaten egg whites. Bake at 350 degrees 10 to 15 minutes.