Cut the tops off the bell peppers and remove the seeds and membranes, making sure to keep them intact.
In a large mixing bowl, combine the shredded chicken, cooked fettuccine, heavy cream, half of the Parmesan cheese, Cajun seasoning, diced tomatoes, garlic powder, salt, and pepper. Mix well until everything is evenly coated.
Drizzle olive oil over the insides of the bell peppers and sprinkle with a pinch of salt.
Stuff each pepper generously with the Cajun chicken Alfredo mixture, packing it in well.
Place the stuffed peppers upright in a baking dish. If they do not stand well, you can slice a small amount off the bottoms to create a flat base.
Cover the baking dish with aluminum foil and bake in the preheated oven for 25 minutes.
Remove the foil, sprinkle the remaining Parmesan cheese on top of each stuffed pepper, and bake uncovered for an additional 10-15 minutes, or until the cheese is bubbly and golden.
Once cooked, remove the stuffed peppers from the oven and let them cool for a few minutes before serving.
Garnish with freshly chopped parsley.
Notes
Feel free to adjust the Cajun seasoning to your spice preference.