Creating Chicken Parmesan-Stuffed Shells is simple if you follow these straightforward steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Cook the Pasta: Boil the pasta shells according to package instructions until al dente. Drain and set aside.
3. Prepare the Filling: In a large bowl, mix the shredded chicken, ricotta cheese, half of the mozzarella cheese, Parmesan cheese, Italian seasoning, garlic powder, salt, and pepper until well combined.
4. Stuff the Shells: Using a spoon, fill each pasta shell with the chicken and cheese mixture.
5. Prepare the Baking Dish: Spread 1 cup of marinara sauce on the bottom of a 9×13 inch baking dish.
6. Arrange the Shells: Place the stuffed shells in the baking dish, open side up.
7. Top with Sauce: Pour the remaining marinara sauce over the top of the stuffed shells.
8. Add Cheese: Sprinkle the remaining mozzarella cheese over the sauce.
9. Bake: Cover the dish with aluminum foil and bake for 20 minutes. Then remove the foil and bake for an additional 10-15 minutes until the cheese is bubbly and golden.
10. Garnish: Remove from the oven and let cool for a few minutes. Garnish with fresh basil before serving.

These steps will guide you in creating these incredible Chicken Parmesan-Stuffed Shells effortlessly!