Kosha's Easy Lasagna

Layer cooked ravioli, canned tomato sauce, frozen spinach, mozzarella cheese, and any other lasagna ingredients you like (squash, mushrooms, sausage) in a casserole dish. It only takes a few minutes to cook the ravioli and toppings, and it bakes in 20 minutes. You can also pre- assemble and refrigerate for a day or two.