Cook a diced onion, 3 cloves of minced garlic, and a pound of lean ground beef together in a skillet until the onion and garlic are tender and the beef is browned. Remove this from the heat.
Meanwhile, dice the green bell peppers, discarding the seeds & core.
Combine the diced peppers with the beef mixture, along the diced tomatoes, tomato sauce, rice, Worcestershire sauce, beef broth, corn, black pepper, and salt. Stir it all together.
Spread the mixture into a lightly greased, 2-inch deep casserole pan. Cover tightly with foil and bake for 1 hour.
After it has baked for an hour, remove the foil and sprinkle the shredded mozzarella cheese over the top.
Bake this uncovered for 8-10 more minutes, or until the cheese is melted and bubbly.