In a large mixing bowl, combine the cooked rotini pasta, diced chicken breast, blanched broccoli florets, and Alfredo sauce. Stir until all ingredients are well coated.
Add garlic powder, Italian seasoning, salt, and pepper to the mixture, adjusting to taste.
Transfer the pasta mixture into a greased baking dish, spreading it evenly.
Sprinkle the shredded mozzarella cheese and grated Parmesan cheese generously over the top of the pasta.
Cover the baking dish with aluminum foil and place it in the preheated oven. Bake for 20 minutes.
After 20 minutes, remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden.
Remove from the oven and let it sit for a few minutes before serving.
Garnish with fresh chopped parsley for an extra pop of color.
Notes
Let the dish sit for a few minutes before serving for better texture.