One-Dish Meatball and Ravioli Casserole

Preheat the oven to 400 degrees F (200 degrees C). Spray a 9x13-inch casserole dish with olive oil spray.

Pour about 1/2 of the marinara sauce into the bottom of the dish. In a single layer, place 1/2 of frozen ravioli on the sauce along with 1/2 of meatballs, and 1 cup mozzarella cheese.

Place the remaining ravioli, meatballs, marinara sauce, and mozzarella cheese in that order on the casserole; sprinkle with Parmesan cheese and red pepper flakes. Cover with aluminum foil.