1 lb. hamburger
1 med. onion, chopped
1 box macaroni and cheese
1 (15-16 oz.) jar spaghetti sauce
2 c. grated Mozzarella cheese

Brown hamburger with onion. Prepare macaroni and cheese according to package directions. Add to hamburger mixture. Add spaghetti sauce to hamburger mixture. Put half of the mixture in casserole. Add grated Mozzarella cheese. Add rest of hamburger mixture. Bake 30 minutes at 350 degrees.