In a large pot of boiling salted water, cook the jumbo pasta shells according to package instructions until al dente. Drain and set aside to cool slightly.
In a large mixing bowl, combine the shredded chicken, ricotta cheese, half of the mozzarella, Parmesan cheese, Cajun seasoning, garlic powder, salt, and pepper. Mix until well combined.
Carefully fill each cooked pasta shell with the chicken and cheese mixture. Place the stuffed shells in a lightly greased 9x13-inch baking dish.
Pour the marinara sauce evenly over the stuffed shells, ensuring that each shell is covered. Sprinkle the remaining mozzarella cheese over the top.
Cover the dish with aluminum foil and bake for 20 minutes. Then, remove the foil and bake for an additional 10-15 minutes or until the cheese is bubbly and golden brown.
Remove from the oven and let it sit for 5 minutes. Garnish with fresh parsley before serving.
Notes
Let the dish sit for a few minutes before serving for better flavor.