1. Brown ground beef and drain. Add 1/4 of the spaghetti sauce in with the beef. Stir to combine.
2. Spread 1/4 of the spaghetti sauce in the bottom of a casserole dish.
3. Add a layer of frozen ravioli.
4. Add half of the ground beef mixture over the ravioli.
5. Sprinkle with 1/3 cup of mozzarella.
6. Add second layer of ravioli, a layer of remaining ground beef, and another 1/3 of cheese.
7. Final layer of ravioli, final layer of remaining spaghetti sauce, and top with remaining mozzarella cheese.
8. Bake at 350°F for 30-40 minutes.
Crockpot version: spray crockpot, same assembly, cook on low 3-4 hours.
