Bake 11x7-inch uncovered about 25 minutes, 8-inch square uncovered about 30 minutes or until slightly set. Meanwhile, in large bowl, stir together Topping ingredients just until moistened; spread evenly over mixture in baking dish. Bake 11x7-inch 35 to 40 minutes longer, 8-inch square 40 to 45 minutes longer or until deep golden brown. For an appetizer, cool completely; cut into 1-inch squares. For a main dish, cool 5 minutes, cut into 8 squares; serve warm on lettuce with sliced tomatoes.