Preheat the oven to 375°F. Lightly coat a 9x13-inch baking dish with cooking spray.
In a large skillet over medium heat, brown the ground beef, breaking it up as it cooks. Drain any excess fat.
Add the diced bell peppers, onion, garlic, spices, salt, and pepper to the skillet. Cook until the veggies soften. Stir in Worcestershire sauce.
Pour the beef mixture into the prepared casserole dish. Add the beef broth and diced tomatoes, then stir in the uncooked rice. Mix everything together until well combined.
Cover the casserole dish tightly with foil and bake for 45 minutes, or until the rice is tender and the liquid is absorbed.
Remove the foil, sprinkle the cheese on top, and bake for 3-5 minutes, until the cheese is melted and bubbly.
Let the casserole rest for at least 5 minutes before serving. Enjoy!