1 1/2 lb. hamburger, browned and drained
2 lg. bags Mozzarella cheese
1 chopped onion
1 pkg. sliced pepperoni
2/3 box rigatoni noodles, cooked
1 can cream of mushroom soup
1 can mushrooms
2 cans pizza sauce

Alternate layers in crockpot as follows: hamburger, noodles, cheese, soup, mushrooms, onions, sauce and pepperoni. Heat 4 hours on low in crock pot.