Preheat your oven to 375°F (190°C).
Cook the pasta shells according to package instructions until al dente.
In a pan, heat olive oil over medium heat and sauté minced garlic until fragrant, about 1 minute.
In a large bowl, combine cooked chicken, ricotta cheese, 1/2 cup mozzarella, 1/4 cup parmesan, heavy cream, Cajun seasoning, salt, and pepper. Mix well.
Drain the cooked pasta shells and allow them to cool slightly.
Stuff each shell with the chicken mixture and place them in a baking dish.
Pour the remaining cream over the stuffed shells and sprinkle with the remaining mozzarella and parmesan.
Cover the baking dish with foil and bake for 25 minutes. Remove foil and bake for an additional 10 minutes until cheese is bubbly and golden.
Garnish with fresh parsley before serving.