Preheat your oven to 375°F (190°C). Lightly grease your 9x13 inch baking dish to prevent sticking.
Spread 1 cup of marinara sauce evenly on the bottom of your prepared baking dish.
Place the frozen cheese ravioli in a single layer over the sauce. No need to thaw first.
Pour the remaining 1 cup of marinara sauce over the ravioli, spreading evenly. Then sprinkle 2 cups of shredded mozzarella cheese on top.
Finish with a generous 1/2 cup of grated parmesan cheese to form a golden, crispy topping.
Cover the dish with foil and bake for 25 minutes. Remove the foil and bake for an additional 10 minutes until cheese is bubbly and golden brown.
Let the dish rest for 5 minutes after baking. Sprinkle with fresh parsley if desired, slice, and serve hot.