Preheat the Oven:
Preheat your oven to 375°F (190°C). Grease a 9x13-inch baking dish with non-stick cooking spray or butter.
Cook the Pasta:
Cook the pasta according to the package instructions until al dente. Drain and set aside.
Prepare the Alfredo Sauce:
In a large skillet, heat olive oil over medium heat. Add the minced garlic and sauté for 1-2 minutes until fragrant. Add the heavy cream, milk, Parmesan cheese, Italian seasoning, salt, and pepper. Stir to combine and bring to a simmer. Allow the sauce to cook for 3-5 minutes, or until it thickens slightly.
Combine Pasta and Chicken:
In a large bowl, combine the cooked pasta and shredded chicken. Pour the Alfredo sauce over the pasta mixture and stir until everything is evenly coated.
Assemble the Bake:
Transfer the pasta mixture to the prepared baking dish. Sprinkle the top with 1 cup of shredded mozzarella cheese.
Bake:
Cover the baking dish with aluminum foil and bake for 20 minutes. Then, remove the foil and bake for an additional 10 minutes, or until the cheese is melted and bubbly.
Finish and Serve:
Once the Chicken Alfredo Bake is done, remove it from the oven and let it cool for a few minutes before serving. Garnish with fresh parsley if desired.