Preheat your oven to 400 °F
Grease a 9x13 baking dish
Spread about 3/4 cup of your pasta sauce onto the bottom of your baking dish.
Place half of the frozen ravioli in a single layer over your sauce.
Top with half of the remaining sauce and half of the mozzarella cheese.
Repeat the layers again ( ravioli, sauce and cheese) Finish by sprinkling Parmesan cheese if you'd like.
Cover the baking dish with foil and bake for 30 min.
Remove the foil and bake for 15 minutes, or until the cheese is bubbly and starting to brown.
Let cool for 5-10 minutes and enjoy!