Aunt Sadie'S Jam Bars - cooking recipe

Ingredients

1/2 lb. butter (2 sticks)
3/4 c. sugar
3 egg yolks
3 c. cake flour (you can use regular flour if you subtract 2 Tbsp. per c.)
1/2 tsp. baking powder
1 tsp. vanilla
1 c. or more either strawberry or raspberry preserves
2 Tbsp. flour
1 c. chopped nuts
3 stiffly beaten egg whites

Preparation

Bottom Layer:
Cream the butter with the sugar.
Blend in the egg yolks, flour, baking powder and vanilla.
Using heel of hand, fit dough into bottom of a 10 x 12-inch baking pan.