Cheeseburger Pie

1 1/2 lb. ground beef 1/2 bell pepper, chopped
1/2 onion, chopped 1 lb. sliced cheese
Bowl of left-over mashed potatoes
Brown the ground beef then stir in the peppers and onions, cook until vegetables are tender, drain. Layer in the bottom of a 9x13 pan. Cover this with a layer of mashed potatos and top with the cheese. Bake at 375º until the cheese is completely melted.