Cream: 1 cup butter add gradually 1/2 cup sugar Beat in: 2 egg yolks Blend in: 1 tsp vanilla 2 cups flour 1/4 tsp salt 3 Tblspn poppy seed Chill: Shape into 1 inch balls. Make a dent in the middle of each cookie with thumb or finger. Bake at 375 for 10 minutes. Melt chocolate chips and fill depression with chocolate. Cool Makes about 4 dz.