Apple Betty Squares

Directions

1. 1
   Preheat oven to 350F.
2. 2
   Grind bread to fine crumbs in a food processor.
3. 3
   Spread in a shallow baking pan and toast in middle of oven, stirring once, until golden, about 5 minutes.
4. 4
   Leave oven on.
5. 5
   Cut butter into 1/2-inch pieces, then pulse in a food processor with flour, brown sugar, and salt until it begins to form small lumps.
6. 6
   Sprinkle base into a 13- by 9-inch baking pan and press evenly onto bottom.
7. 7
   Bake in middle of oven until golden, about 20 minutes.
8. 8
   Melt butter and keep warm.
9. 9
   Peel, quarter, and core apples and thinly slice quarters crosswise.
10. 10
    Stir together sugar and flour in a small bowl.
11. 11
    Sprinkle half of sugar mixture over hot shortbread, then top with apples and sprinkle with remaining sugar mixture.
12. 12
    Top with bread crumbs and drizzle all of butter over them.
13. 13
    Bake in upper third of oven, pressing down on filling with a metal spatula halfway through baking, until apples are very tender and bread crumbs are golden, 50 minutes to 1 hour total.
14. 14
    Cool 20 minutes in pan on a rack.