Preheat your oven to 350°F (175°C) to prepare for baking.
In a large pot, fill it with salted water and bring it to a rolling boil. Add the fresh broccoli florets and blanch for about 2-3 minutes, or until they turn bright green and are slightly tender. Once done, take them out and set aside to cool.
In a spacious mixing bowl, combine the cooked rotini pasta, shredded chicken, blanched broccoli, and Alfredo sauce. Sprinkle in the garlic powder, onion powder, red pepper flakes (if using), and season generously with salt and pepper. Mix everything together thoroughly until all ingredients are evenly coated with the sauce.
Lightly grease a baking dish with the olive oil to prevent sticking. Carefully pour the chicken and pasta mixture into the dish, spreading it out evenly to ensure uniform cooking.
Generously sprinkle the shredded mozzarella and grated Parmesan cheese over the top of the mixture, making sure it covers the entire surface for a deliciously cheesy crust.
Place the baking dish in the preheated oven and bake for about 25-30 minutes, or until the cheese is melted, bubbly, and golden brown.
Once baked, remove the dish from the oven and allow it to cool for a few minutes to set. This will make it easier to serve without falling apart.
Notes
Serve in individual bowls, garnished with a sprinkle of fresh parsley or extra Parmesan cheese for a pop of color and flavor!