lbs. hamburger
Mushrooms
Onion
2 c. shredded Mozzarella cheese
15 to 20 cooked shells
16 oz. jar spaghetti sauce
Peppers, sausage, cheddar cheese, optional

Cook hamburger, onions, and mushrooms. Drain fat and pour into medium bowl. Add 1 3/4 cup mozzarella cheese to hamburger. Scoop hamburger, cheese mixture and put into shells. Line in baking pan and pour sauce over shells, and sprinkle the rest of cheese over shells. Cook at 350 degrees for about 1/2 hour.