1/2 lb. elbow macaroni, cooked and drained
1 can drained tuna
1 sm. onion, chopped
1 can cream of mushroom soup
3 slices American cheese
1/3 c. bread crumbs

Put macaroni in casserole dish. Add soup, onions, tuna; mix well. Top with cheese in strips and bread crumbs to cover. Bake at 350 degrees for 1/2 hour.