1 (12 oz.) pkg. shredded Mozzarella cheese
1 (48 oz.) jar spaghetti sauce
1 1/2 lbs. hamburger
1 lb. box rigatoni
Salt (to taste)
Pepper (to taste)
1 tsp. onion flakes

Brown hamburger with onion, salt and pepper; drain. Cook rigatoni according to directions. Mix ingredients with sauce. Put in 9 x 13-inch pan. Sprinkle with cheese. Bake 10 to 20 minutes in preheated oven (350 degrees) until cheese is melted. Cut in squares and serve. Freezes well.