To make the ravioli lasagna, begin by preheating your oven to 375°F. In a medium mixing bowl, In a 9x13 inch baking dish, spread about 1 cup of the marinara sauce on the bottom of the pan. Next, place a single layer of frozen ravioli over the sauce, making sure to cover the entire bottom of the dish.
Cover the baking dish with aluminum foil and bake in the preheated oven for 30 minutes. After 30 minutes, remove the foil and continue baking for another 10-15 minutes until the cheese is golden brown and bubbly.