This is like the ultimate in lazy lasagna. I added beef to it so it would qualify to come to the party, but usually I do it as a meatless meal and kinda think it's better that way...
1 jar spaghetti sauce
1 can diced tomatoes, undrained
1/2 C water
2 lbs frozen cheese ravioli
1 (7 oz)pkg shredded cheese, italian blend
2 tbsp parmesan cheese
Heat oven to 400 degrees. Mix spaghetti sauce, tomatoes and water; spoon 1 C onto bottom of 9x13" pan. Layer half the ravioli and 1 C shredded cheese over sauce mixture. Top with remining ravioli and sauce mix. Sprinkle with remaining shredded cheese; cover. Bake 30 minutes, uncover. Bake 15 more minutes or until ravioli is tender and heated through. Sprinkle with parmesan. Let stand 10 minutes.
I used spinach raviolis that I got from Costco. It came with a packet of topping which I sprinkled over each cheese layer.