Apple Betty Squares

For Shortbread:

Preheat oven to 350 degrees. Combine flour, brown sugar, salt and butter in a food processor. Blend until clumps form. Sprinkle evenly over the bottom of a 13x9 inch baking pan and press to form crust. Bake about 20 minutes until golden. Meanwhile, prepare filling.

For Filling:

Stir together sugar and flour in a small bowl. Sprinkle half of mixture evenly over shortbread crust. Top with sliced apples and sprinkle with remaining sugar-flour mixture. Sprinkle breadcrumbs evenly over. Drizzle butter over breadcrumbs. Bake 25 minutes. Press down on top with a spatula. Bake an additional 25 to 35 minutes until apples are tender and breadcrumbs are golden. Cool 20 minutes in pan on a rack before cutting into squares.