Preheat your oven to 350°F (175°C). This ensures that the casserole cooks evenly and thoroughly.

In a large skillet over medium heat, add the ground beef. Cook until browned, breaking it apart with a wooden spoon, about 5-7 minutes.

Once the beef is browned, drain any excess fat. This step is crucial to avoid a greasy casserole.

Add the chopped onion and bell pepper to the skillet. Sauté for 3-4 minutes until they are softened.

Stir in the garlic powder, onion powder, salt, black pepper, and Italian seasoning. This will enhance the flavor of the beef and vegetables.

Add the rinsed rice, diced tomatoes (with juice), and beef broth to the skillet. Stir well to combine all ingredients.

Bring the mixture to a simmer, then remove from heat. This allows the rice to absorb the flavors of the beef and spices.

Transfer the mixture to a greased casserole dish. Spread it evenly to ensure even cooking.

Cover the dish with aluminum foil and bake in the preheated oven for 30 minutes. This traps steam and helps the rice cook properly.

After 30 minutes, remove the foil and sprinkle the shredded cheddar cheese on top. Return to the oven and bake for an additional 10-15 minutes, until the cheese is melted and bubbly.

Once done, remove from the oven and let it sit for 5 minutes before serving. This resting time allows the casserole to set, making it easier to serve.