Slice the tops off the bell peppers and remove the seeds and membranes. Place them upright in a baking dish.
In a large mixing bowl, combine shredded chicken, cooked fettuccine, Alfredo sauce, Cajun seasoning, garlic powder, and black pepper. Mix well until all ingredients are combined.
Fold in the halved cherry tomatoes for added freshness and color.
Using a spoon, generously fill each bell pepper with the chicken Alfredo mixture.
After filling, sprinkle the tops of the stuffed peppers with shredded mozzarella cheese.
Drizzle olive oil over the stuffed peppers to enhance flavor and prevent drying.
Cover the baking dish with aluminum foil and bake for 25 minutes.
Remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden brown.
Once cooked, remove from the oven and let them cool for a few minutes. Garnish with fresh parsley before serving.