Preheat the oven to 350°F (175°C).
Cook the fettuccine according to package instructions until al dente.
In a large saucepan, combine the heavy cream, garlic powder, salt, pepper, and Italian seasoning over medium heat.
Gradually stir in the Parmesan cheese until the sauce thickens.
In a large mixing bowl, combine the cooked chicken, broccoli, cooked fettuccine, and Alfredo sauce.
Transfer the mixture into a greased baking dish and sprinkle with mozzarella cheese.
Bake in the preheated oven for 25-30 minutes, or until bubbly and golden.
Let the dish sit for 5-10 minutes before serving.
