In a large skillet, heat 2 tablespoons of olive oil over medium-high heat. Once hot, add 1 pound of lean ground beef, breaking it apart with a spatula. Cook for about 5-7 minutes, stirring frequently, until the beef is browned and no longer pink. Be sure to drain any excess grease before moving to the next step.

Stir in one diced yellow onion, one diced red bell pepper, and one diced green bell pepper into the skillet with the cooked beef. Add 2 minced garlic cloves for an aromatic boost. Sauté the vegetable mixture for 5-7 minutes until the onions are translucent and the peppers are tender, creating a vibrant and flavorful base for your Stuffed Pepper Casserole.

Once the vegetables are tender, add in 1 tablespoon of Italian or Cajun seasoning, 1 tablespoon of Worcestershire sauce, 1 teaspoon of salt, and ½ teaspoon of ground black pepper. Mix everything thoroughly to combine the flavors. Cook for an additional minute, allowing the seasoning to meld beautifully with the beef and veggies.

Next, stir in 1 can of diced tomatoes (with their juices) and 1 cup of uncooked long grain white rice. Ensure everything is evenly combined, creating a hearty mixture for your casserole. The rice will soak up all the wonderful flavors during cooking, making each bite of the Stuffed Pepper Casserole absolutely delicious.

Pour in 2 cups of beef broth, stirring the mixture once more until everything is well incorporated. Bring it to a boil over medium-high heat, then reduce the heat, cover, and let it simmer for about 20 minutes. During this time, the rice will cook and absorb the liquid, creating a savory filling for your casserole.

While the mixture simmers, preheat your oven to 375°F (190°C). Once the rice is cooked and the liquid is mostly absorbed, transfer the skillet mixture into a greased casserole dish. Spread it out evenly, preparing it for the ultimate cozy finish.

Generously sprinkle 1-2 cups of shredded cheddar or mozzarella cheese on top of the rice and beef mixture in the casserole dish. This layer of cheese will melt beautifully in the oven, becoming a deliciously gooey topping for your Stuffed Pepper Casserole.

Place the casserole in the preheated oven and bake for 15-20 minutes, or until the cheese is melted and bubbly with a hint of golden color. Keep an eye on it to prevent over-browning, ensuring your meal arrives at the table looking and smelling irresistible.

Once the casserole is done baking, remove it from the oven and let it cool for a few minutes before garnishing with freshly chopped parsley. This brief cooling period allows the flavors to settle. Serve it warm, and watch as family and friends enjoy this comforting Stuffed Pepper Casserole!