I start by preheating the oven to 350°F (175°C) and greasing my casserole dish. This ensures the pasta bake doesn’t stick and makes cleanup easier.
Next, I cook the rotini pasta to al dente in salted boiling water. I drain it carefully so it doesn’t overcook, which keeps the pasta firm after baking.
In a large mixing bowl, I combine the pasta, diced chicken, Alfredo sauce, garlic parmesan sauce, half the mozzarella, and half the Parmesan. I season it with salt and pepper, stirring gently to coat everything evenly.
I spoon the mixture into the prepared baking dish. Then, I top it with the remaining mozzarella and Parmesan cheeses for a cheesy crust that melts beautifully in the oven.
Covering the dish with foil, I bake it for about 20-25 minutes until hot and bubbly. For a golden, slightly crisp top, I remove the foil in the last 5 minutes.