2 boxes cheese ravioli
1 jar marinara sauce
2 (8 ounce) packages shredded mozzarella or pizza cheese
1 (10 ounce) package frozen chopped spinach (optional)

Preheat oven to 350 degrees. In a 9 x 13-inch pan place small layer of sauce. Next add a layer of ravioli. Sprinkle cheese over ravioli and cover with sauce. If your family likes spinach, add a layer here. Add another layer of ravioli, more sauce and cover the whole top with cheese. Bake, uncovered, for 45 minutes to 1 hour.