This is seriously the easiest thing to make. And it only has four ingredients. Easiest. Thing. Ever. I kid you not. It doesn't even need any more explanation than that. So I'm done.
1 25oz package frozen ravioli, any variety
1 jar pasta sauce, whatever kind you like
2 cups shredded mozzarella cheese
<1 cup shredded parmesan cheese, for sprinkling
Grease a 9x13 baking dish. Spread about 3/4 cup sauce over the bottom of the dish to coat. Arrange half of the ravioli over the sauce in one layer. Spread about 1 cup sauce over the ravioli, then sprinkle 1 cup mozzarella over the sauce. Create another layer with the remaining ravioli, top with remaining sauce and mozzarella cheese. Sprinkle parmesan over mozzarella. Cover dish with aluminum foil. Bake at 400* for 30 minutes. Remove foil, bake for another 10-15 minutes until cheese is melted and slightly browned. Let stand for 5 minutes before serving.