Creating Stuffed Pepper Casserole can be a straightforward process if you follow these step-by-step instructions:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Cook Meat: In a large skillet over medium heat, brown the ground beef (or turkey) until fully cooked. Drain excess fat.
3. Sauté Vegetables: Add the chopped onions and bell peppers to the skillet. Cook until softened, approximately 5 minutes.
4. Combine Ingredients: Stir in the cooked rice, diced tomatoes, tomato sauce, Worcestershire sauce, garlic powder, Italian seasoning, salt, and pepper. Mix well to combine.
5. Transfer to Baking Dish: Pour the mixture into a greased 9×13-inch casserole dish. Smooth it out evenly.
6. Add Cheese: Sprinkle the shredded cheese evenly over the top of the casserole.
7. Bake: Place the casserole in the preheated oven. Bake for 30-35 minutes or until the cheese is melted and bubbly.
8. Cool Slightly: Remove from the oven and let it cool for a few minutes before serving.
9. Garnish: Sprinkle chopped fresh parsley on top if desired, for an added pop of color and flavor.

This easy-to-follow guide streamlines the process, ensuring that your Stuffed Pepper Casserole turns out delicious every time.