Uses pre-made, frozen ravioli
                    Heat oven to 350 degrees. Coat a 13-by-9-inch baking dish with cooking spray and spoon a thin layer of sauce on the bottom.
On top of sauce, layer 1/3 of the ravioli, half the spinach, half the mozzarella and 1/3 of the sauce. REPEAT.
Top with the remaining 1/3 of the ravioli and sauce. Sprinkle with Parmesan.
Cover with foil and bake 30 minutes. Uncover and bake 5 to 10 minutes more or until bubbly.