2 lb. frozen ravioli (cheese, meat, spinach....whatever you like)
1 (24oz) jarred pasta sauce
2 cups shredded mozzarella
1 1/2 cups ricotta (whole milk or skim)
Preheat oven to 375°
Grease a 9x13" baking dish. Pour a small amount of sauce in the bottom of the dish and spread evenly. Lay 1/3 of the ravioli in an even layer over the sauce. Spread about 1/2 cup of ricotta over the ravioli. Sprinkle about 1/2 cup of mozzarella over the ricotta. Repeat the layers until you have 3 layers (sauce, ravioli, ricotta, mozzarella)
Cover with foil and bake for 35 minutes or until heated through. Remove the foil and bake for an additional 10 minutes until the cheese becomes browned.