Preheat your oven to 375°F (190°C) and grease a 9x13 inch baking dish with olive oil.
Bring a large pot of salted water to a boil, add the fettuccine pasta, and cook until al dente, about 8-10 minutes. Drain and set aside.
In a large mixing bowl, combine the shredded chicken, steamed broccoli florets, and cooked fettuccine.
Pour the Alfredo sauce over the mixture, add garlic powder, onion powder, red pepper flakes (if using), and season with salt and pepper. Mix gently until well-coated.
Transfer the mixture into the prepared baking dish, spreading it evenly.
Sprinkle the top with shredded mozzarella and grated Parmesan cheese.
Cover with aluminum foil and bake for 20 minutes. Remove the foil and bake uncovered for an additional 10-15 minutes until the cheese is melted and bubbly.
Allow to cool for a few minutes before serving.
Notes
Serve hot and consider garnishing with parsley or basil for a fresh touch.