Preheat the Oven:

• Preheat your oven to 350°F. Lightly grease a 9×13-inch casserole dish and set aside.

Combine Ingredients:

• In a large mixing bowl, combine the cooked rotini pasta, diced or shredded chicken, Alfredo sauce, garlic Parmesan sauce, half of the shredded mozzarella cheese, and half of the grated Parmesan cheese. Season with salt and black pepper to taste. Mix everything together until well combined.

Assemble the Casserole:

• Pour the pasta mixture into the prepared baking dish and spread it out evenly.

Add Toppings:

• Sprinkle the remaining shredded mozzarella cheese and grated Parmesan cheese evenly over the top of the pasta mixture.

Bake:

• Cover the baking dish with aluminum foil and place it in the preheated oven. Bake for about 20-25 minutes, or until the cheese is melted and bubbly, and the pasta bake is heated through.

Optional Broiling:

• If desired, remove the foil and place the casserole under the broiler for 2-3 minutes until the top is golden brown. Watch it carefully to prevent burning.

Garnish and Serve:

• Remove the casserole from the oven and let it sit for a few minutes before serving. Garnish with chopped fresh parsley, if desired. Serve warm.