Spinach Ravioli Bake

2 cups spaghetti sauce
1 package frozen Italian sausage ravioli or ravioli of your choice
2 cups shredded mozzarella cheese
1 package frozen chopped spinach, thawed and squeezed dry
1/4 cup grated Parmesan cheese

Preheat oven to 350. Place 1 cup spaghetti sauce in a greased shallow 2 quart baking dish. Top with half of the ravioli, mozzarella cheese, spinach and Parmesan cheese. Repeat layers. Bake, uncovered at 350 for 40-45 minutes or until heated through and cheese is melted.