Preheat the oven to 375°F (190°C).
In a large bowl, combine the cooked chicken, cooked rotini pasta, Alfredo sauce, mozzarella cheese, Parmesan cheese, milk, garlic powder, salt, and pepper.
Transfer the mixture to a baking dish and spread it out evenly.
Bake in the preheated oven for 20-25 minutes, or until the cheese is melted and bubbly.
Garnish with fresh parsley before serving.
