Follow these simple steps to create your own Million Dollar Chicken Alfredo Stuffed Shells:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Pasta: Cook the pasta shells according to package instructions until al dente. Drain and set aside.
3. Mix Filling: In a large bowl, combine the cooked chicken, ricotta cheese, ½ cup mozzarella cheese, ¼ cup Parmesan cheese, garlic powder, Italian seasoning, salt, and pepper. Mix until well combined.
4. Stuff Shells: Take each pasta shell and fill it generously with the chicken mixture. Place filled shells in a baking dish.
5. Add Alfredo Sauce: Pour Alfredo sauce evenly over the stuffed shells, ensuring each is well covered.
6. Top with Cheese: Sprinkle remaining mozzarella and Parmesan cheese over the top of the sauce.
7. Bake: Cover the dish with foil and bake in the preheated oven for 25 minutes. Remove the foil and bake for an additional 10-15 minutes until the cheese is bubbly and golden brown.
8. Cool Slightly: Once done, take the dish out of the oven and let it cool for 5-10 minutes.
9. Serve: Garnish with fresh parsley if desired and serve warm.

These clear steps will guide you flawlessly through making this incredible dish, ensuring each component shines in flavor and presentation.