Cream together the butter, yolks, and 1/2 C.sugar.

Add flour and salt and knead with fingers.

Pat dough into a greased 15 1/2 by 10 1/2 by 1 in. Jelly Roll pan.

Bake at 350* 15-20 minutes until lightly browned.

Remove from oven and spread with jelly.

Beat egg whites until stiff. Fold in remaining 1 C. sugar.

Gently spread on top of jelly. Bake for 25 minutes.

Cut into bars while still warm.