1 Preheat oven to 350°F.2 In a small bowl, combine bread cubes with butter; mix well.3 Press half of mixture in bottom of a 9-inch square glass pan.4 In another bowl, combine apple slices, brown sugar, cinnamon, allspice, nutmeg, lemon zest, lemon juice, vanilla, raisins and concentrate.5 Turn apple filling into pan; spread evenly and top with remaining bread mixture.6 Cover with foil and bake at 350°F for 35 minutes.7 Increase oven temperature to 400°F; uncover and bake for 20 minutes more.8 Cut into 9 squares and serve warm topped with frozen nonfat vanilla yogurt, if desired.