Pour in the spaghetti sauce and garlic powder, simmer for 5 minutes.
Cover the bottom of a 9x13 baking dish with a small amount of the sauce mixture, place ravioli in a single layer on top of the sauce. Now spread some sauce over the ravioli and sprinkle some mozzarella on top. Keep layering like this as you would layer lasagna, finishing with sauce.
Sprinkle some parmesan cheese on top, just a small amount.