Lazy Day Spinach Lasagna

I found this recipe in a magazine.  It's a keeper. It was really easy, add the spinach you and can sneak some vitamins in there.  Sneaky.  If you need a lazy day kind of recipe....here it is....
Spinach Ravioli Lasagna
Ingredients:  1 1/2 jars (26 oz) marinara sauce, 3 (13 oz) pkg frozen ravioli, 1 (10 oz) pkg frozen chopped spinach (thawed and squeezed dry), 8 oz grated mozzarella cheese, 1/2 c. Parmesan cheese
Instructions: 
1.  Preheat oven 375
2.  Spread a thin layer of sauce in 9x13 inch pan.  Arrange a layer of frozen ravioli in a single layer.  Add half of the spinach, 1/2 of the sauce, and half of the mozzarella cheese. 
3.  Repeat layers.  Top with Parmesan cheese. 
4.  Cover pan with foil.  Bake for 35 min.  Uncover and bake 15 minutes (until cheese is melted and pasta is cooked).  Let stand 5 minutes.