Macaroni Pizza Casserole
["1/2 lb. ground beef", "1/2 c. chopped onions", "8 oz. small macaroni, cooked and drained", "2 (8 oz.) cans tomato sauce", "1/4 c. water", "1 tsp. oregano", "salt and pepper as desired", "small pepperoni (optional)", "1 c. grated cheese"]
["Brown beef and onions together (drain).", "Mix with macaroni. Add tomato sauce and seasonings.", "Toss well.", "Top with cheese and pepperoni (optional).", "Bake 15 to 20 minutes at 375\u00b0."]
["ground beef", "onions", "macaroni", "tomato sauce", "water", "oregano", "salt", "pepperoni", "grated cheese"]