Cranberry-Apple Pie Squares

1 tablespoon sugar

1/4 teaspoon salt

1/2 cup butter or margarine

1 egg yolk

1/4 cup milk

8 1/2 cups thinly sliced, peeled baking apples (3 lb.; about 9 medium)

1 cup sugar

1/4 cup Gold Medal® all-purpose flour

2 teaspoons cinnamon

1/2 teaspoon salt

1 cup chopped fresh or frozen cranberries, thawed

1 cup Gold Medal® all-purpose flour

1/2 cup firmly packed brown sugar

1/2 cup butter or margarine, softened

1 cup caramel ice cream topping, heated

Vanilla or cinnamon ice cream, if desired