Easy Ravioli Lasagna

I found this recipe in a Kraft food magazine (changed it a bit) and all the cheese lovers in my family loved it.

2 jars of spaghetti sauce
1 can of undrained diced tomatoes
dehydrated onion
2 bags of frozen ravioli
Mozzarella cheese
Cheddar cheese

Mix sauce, tomatoes, onion and spoon about a cup into the bottom of a 13 X 9 pan. Lay out the frozen ravioli square by square to cover pan. Cover with sauce and sprinkle cheese on it. Repeat layers with sauce, ravioli and cheese, ending with cheese. Bake covered at 400 for 30 minutes, then uncover and bake for 15 more minutes.

No pictures - no leftovers.