This is the one I told you about at girl's day! You probably have made something similar, but this is so good!
1 jar Prego, any flavor
1 can diced tomatoes, undrained. I like petite diced.
1/2 cup water
2 pkgs (1lb. each) frozen cheese ravioli, leave frozen. Can do meat filled if you prefer.
1 pkg shredded Italian cheese blend (2 cups)
Mix Prego with tomatoes and water. Pour 1 cup sauce on bottom of 9x13 baking dish. Layer half the frozen ravioli and 1 cup cheese blend. Repeat ravioli layer and remaining sauce. Top with remaining cheese blend. Cover and bake at 400 for 30 mins. Uncover and continue baking 15 mins till bubbly. Remove from oven and sprinkle with parmesan, let stand 10 mins. Serve.