Bag of frozen ravioli
1 jar of marinara sauce
2 cups of mozzarella cheese
Heat oven to 400°F. Spray bottom and sides of a 9×13 rectangular baking dish with cooking spray.
Spread 3/4 cup of the pasta sauce in baking dish. Arrange half of the frozen ravioli in single layer over sauce; top with half of the remaining pasta sauce and 1 cup of the mozzarella cheese. Repeat layers once, starting with ravioli. Sprinkle with Parmesan cheese.
Cover with aluminum foil and bake 30 minutes. Remove foil; bake uncovered 10 to 15 minutes longer or until bubbly and hot in center. Let stand 10 minutes before serving.