Preheat oven to 400°F

Brush olive oil on the bottom of a 9 by 13 rectangular baking dish or you can use

Spread three-quarters cup of the pasta sauce in the baking dish arrange frozen ravioli in a single layer over the pasta sauce top with the other half of the remaining pasta sauce and half the mozzarella

Lay spinach leaves over the cheese and repeat layer starting with ravioli sauce the rest of the cheese and sprinkle with Parmesan

Cover with aluminum foil and bake for 30 minutes remove aluminum foil and bake for 10 minutes (or until center is hot) let stand for 10 minutes before serving