Everyone's Favorite Stuffed Pasta Shells

Ingredients:
4 cups shredded mozzarella cheese
1 carton (15 oz.) Ricotta cheese
1 pkg. (10 oz.) frozen, chopped spinach, thawed and drained
1 pkg. jumbo pasta shells, cooked and drained
1 jar spaghetti sauce

Directions:
1. Preheat oven to 350 degrees.
2. Combine cheeses and spinach and stuff into shells.
3. Arrange on a greased baking sheet.
4. Pour spaghetti sauce over shells.
5. Cover and bake for 30 minutes or until heated through.