Serve this lasagna with a complete salad, with salad leaves, tomatoes and tuna or ham.
Heat oven to 350° F.
Spoon in half of the pasta sauce into a baking dish. Add half of the frozen ravioli on top in one layer and top with half of the spinach. Sprinkle with half of the cheese and repeat the procedure.
Cover with foil and bake in the oven for about 30 minutes. Remove the foil and bake for a further 5 minutes or until the cheesy is slightly browned and bubbly.