Brown ground beef in a large skillet, about 6-7 minutes. Use a slotted spoon, transfer the browned beef onto a plate lined with paper towels Remove the excess fat from the pan.
Transfer the beef back to the pan and add the pasta sauce. Simmer mixture until warm and set aside.
Spread a thin layer of the beef mixture onto a the bottom of a 9x13 casserole dish.
Top with a layer of frozen ravioli. Add a second layer of the beef mixture and finish with a second layer of frozen ravioli. Add the remaining beef mixture on top of the second layer of ravioli. Sprinkle with shredded mozzarella cheese.
Cover the casserole dish with aluminum foil and bake for 20 minutes at 400° Fahrenheit.
Remove the cover and continue to bake for 15-20 minutes or until the cheese is golden-brown and bubbly. Serve and enjoy.