Preparing Chicken Alfredo Pasta Bake is straightforward. Follow these simple steps to create this delicious dish:

1. Preheat your oven to 350°F (175°C).
2. In a large mixing bowl, combine the cooked penne pasta, shredded chicken, Alfredo sauce, Italian seasoning, garlic powder, salt, and pepper. Stir until well mixed.
3. Transfer the pasta mixture to a greased 9×13-inch baking dish.
4. Sprinkle the shredded mozzarella and grated Parmesan cheese evenly over the top.
5. Cover the baking dish with aluminum foil and bake for 30 minutes.
6. Remove the foil and continue to bake for an additional 15-20 minutes, or until the cheese is bubbly and golden brown.
7. Once cooked, remove from the oven and let cool for about 10 minutes.
8. Garnish with chopped fresh parsley, if desired, before serving.

By following these steps, you will have a delightful Chicken Alfredo Pasta Bake that everyone will enjoy!