Arrange six slices of bread in the bottom of a greased 13-in. x 9-in. baking dish. Top with ham and cheese. Cover with remaining bread.
In a bowl, beat eggs, milk, Worcestershire sauce, mustard, salt, pepper and cayenne. Stir in onion and green pepper; pour over all. Cover and refrigerate overnight.
Remove from the refrigerator 30 minutes before baking. Pour butter over bread; sprinkle with cornflakes. Bake, uncovered, at 350° for 50-60 minutes or until a knife inserted near the center comes out clean. Let stand 10 minutes before serving. Yield: 8-10 servings.