Mom's Apple Slices

1 cup butter or margarine

2 1/2 cups flour

1 tablespoon sugar

1/2 teaspoon salt

1/2 package yeast (1 teaspoon)

2 egg yolks, beaten

1/2 cup milk

8 to 10 apples, peeled and sliced

1 cup sugar

6 tablespoons flour

1 teaspoon vanilla

1/4 cup butter or margarine

Thin powdered sugar frosting

Preheat oven to 350 degrees.  Mix 1 cup butter or margarine, flour, sugar and salt as you would a pie crust.  Add milk and egg yolks.  Roll 2/3 of dough to fit a 9x13 inch pan, bottom and up sides a little.  Put apples over top of crust.  Mix sugar, flour, and vanilla.  Sprinkle over apples and dot with 1/4 cup butter.  Roll out rest of dough and overlap.  Bake for 1 hour.  As soon as it is removed from the oven, frost with a thin powdered sugar icing.  Let set.  Can be frozen in meal sized portions and warmed.