Margie's Buttery Apple Squares

I found this in my Mother's recipe box. Very similar to my Mother-in-laws recipe for Apple Squares.

2 cups sifted flour

1 teaspoon salt

2/3 cup butter

1 slightly beaten egg yolk

1/2 cup milk

5 cups peeled & sliced apples

3/4 to 1 cup sugar

2 tablespoons flour

1 tablespoon butter

1/2 egg white sl. beaten

1/2 cup powd. sugar icing

Sift flour & salt, cut 2/3 c. butter till mix resembles coarse crumbs. Mix egg yolk, milk, stir into flour mix. Pat 1/2 of dough into 10X 6 X2 pan. Cover apples, mix sugar & 2 Tbsp. flour. Sprinkle over apples, dot with 1 Tbsp. butter. Roll remaining dough to fit pan & place over apples; Brush with egg white. Bake at 350 for 1 hr. Top while warm icing. Serves 12. NOTE AFTER RECIPE: add cinnamon. May serve with  cheddar cheese