1 (16 oz.) jar spaghetti sauce
1 (10 oz.) pkg. frozen chopped spinach, thawed, well drained
1 c. Ricotta cheese
1 c. cottage cheese
1 c. shredded Mozzarella cheese
1/4 c. grated Parmesan cheese
1 egg, beaten
9 oz. jumbo shells (approx. 20 shells), cooked, drained

Pour half of sauce into 10"x6" baking dish. Combine spinach, ricotta cheese, 3/4 cup Mozzarella, Parmesan and egg; mix well. Fill each shell with spinach mixture and place in dish. Top with remaining spaghetti sauce; cover. Bake at 350 degrees for 50 minutes. Sprinkle with remaining Mozzarella.