- Preheat the oven to 450 degrees F (230 degrees C).
- Crumble the ground beef into a large skillet over medium-high heat. Cook and stir until no longer pink. Drain grease, then stir in the spaghetti sauce and tomatoes.
- Spread 1/3 of the sauce in the bottom of an 11×7 inch baking dish. Arrange 1/2 of the ravioli over the sauce. Sprinkle 1/2 of the mozzarella cheese and 1/2 of the Monterey Jack cheese over the ravioli. Repeat layers, ending with the last of the sauce on top. Cover with aluminum foil.
- Bake for 30 minutes in the preheated oven. Sprinkle Parmesan cheese over the top before serving.
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