Preheat the oven to 400 degrees F. Spray a 9x13 baking dish with cooking spray.
Spread half of a jar of marinara sauce evenly across the bottom of the prepared baking dish. Add 1 package of ravioli in an even layer over the sauce. Top with the rest of the half jar of marinara sauce. Sprinkle 3/4 cup of mozzarella cheese and 1/4 cup of Parmesan cheese over the sauce. Add another layer of sauce, ravioli, sauce, mozzarella and Parmesan cheese.
Spray a piece of aluminum foil with cooking spray. Cover the dish with aluminum foil, sprayed side down. Bake the lasagna for 30 minutes. Uncover and bake for an additional 15 minutes, or until the cheese is melted and the sauce is bubbly. Remove pan from oven let sit for 5 minutes. Garnish with basil, if desired. Serve warm.
Note-You don't have to thaw or cook the ravioli first, just put it in the pan frozen. We like to serve garlic bread on the side!