Danish Apple Bars

2 1/2 cups flour
2 tablespoons sugar
1 teaspoon salt
1 cup shortening
1 egg, separated
Milk
1 1/2 cups corn flakes, crushed
10 large apples, peeled and sliced
1 cup sugar
1 teaspoon cinnamon
2 tablespoons flour
Butter
1 cup powdered sugar
1 tablespoon water
1/2 teaspoon vanilla

In a large bowl, combine flour, sugar and salt; cut in shortening. In a measuring cup, add enough milk to egg yolk to equal 2/3 cup. Beat together and add to flour mixture. Roll out 1/2 of the dough onto an 11 x 16 cookie sheet that has sides. Spread crushed corn flakes on top of crust. Spread sliced apples evenly on top of crust. In a small bowl, combine sugar, cinnamon and flour. Sprinkle over the top of the apples and dot with butter. Roll out the other half of the dough to fit over the apples. Beat egg white until frothy and spread over top of crust. Bake at 350 degrees for 1 hour. In a bowl, combine powdered sugar, water and vanilla. Spread over top of crust while still warm. Cut bars to desired size.