Preheat your oven to 400° F and grease a 9x13 baking dish.
Spread a thin layer of pasta sauce onto the bottom of the pan, approximately 3/4 cup.
Arrange half of the frozen ravioli into a single layer over the sauce.
Top this first layer of ravioli with half of the remaining sauce followed by half of the shredded mozzarella cheese.
Repeat the layering process starting with what's left of your ravioli, followed by more sauce and another layer of mozzarella cheese on top.
Cover your baking dish with aluminum foil and place it in the preheated oven for about 30 minutes. After this time, remove the foil and continue baking until the cheese is bubbly and starts to brown, usually an additional 15 minutes.