Easy Apricot Bars

1 cup butter
1 cup sugar
1 egg yolk
2 cups flour
3/4 cup walnuts, finely chopped
1 (10 ounce) jar apricot jam

Cream room temperature butter with sugar until fluffy.
Blend in the one egg yolk.
Mix in 2 cups of flour , and the nuts .
Divide dough in two parts.
Spread or press 1 part in a greased 9 x 13 pan.
Cover with the apricot jam.
Drop remaining dough in spoonfuls over the jam, spreading to edges carefully.
Bake in a 350F oven about 40 minutes or until golden.
Cool and cut into squares.