Preheat your oven to 375°F (190°C).
In a large skillet over medium heat, add the sweet Italian sausage. Use a wooden spoon to break it into crumbles as it cooks until browned, about 5-7 minutes.
Add the diced onion and minced garlic to the skillet. Sauté for another 3-4 minutes until the onion is translucent.
Sprinkle in the dried Italian seasoning, Cajun or Creole seasoning, salt, black pepper, and crushed red pepper flakes. Stir well to combine and let the spices infuse for about 1 minute.
Add the fire-roasted diced tomatoes and chicken broth to the skillet, then stir in the cooked rice. Let the filling simmer to meld the flavors.
Prepare the bell peppers by cutting the tops off and removing the seeds. Place them upright in a baking dish.
Spoon the sausage mixture into each bell pepper, packing it down gently.
Sprinkle the shredded Italian cheese on top of each stuffed pepper.
Cover the baking dish with aluminum foil and bake for 25 minutes, then remove the foil and bake for an additional 10-15 minutes until the cheese is bubbly.
Once done, let the peppers cool for a few minutes and garnish with chopped parsley before serving.