Step 1: Preheat Oven and Prepare Baking Dish: Preheat the oven to 375F (190C). Lightly grease a 9x13 inch baking dish. This ensures the pasta bake doesn't stick to the bottom and sides during baking.
Step 2: Cook the Pasta: Cook the pasta according to package directions until al dente. Drain well and set aside. Avoid overcooking, as the pasta will continue to cook in the oven.
Step 3: Saut the Chicken: In a large skillet, melt butter over medium heat. Add the chicken pieces and cook until browned and cooked through, about 5-7 minutes. Add the minced garlic during the last minute of cooking, allowing its fragrance to bloom without burning.
Step 4: Prepare the Alfredo Sauce: Reduce heat to low. Pour in the heavy cream and bring to a simmer. Gradually stir in the Parmesan cheese until melted and smooth. Season with salt and pepper. Ensure the sauce is creamy and well-combined, adjusting seasonings to taste.
Step 5: Combine Ingredients: In the prepared baking dish, combine the cooked pasta, sauted chicken, and Alfredo sauce. Toss gently to ensure all the pasta and chicken are evenly coated with the sauce.
Step 6: Add Mozzarella Cheese and Bake: Sprinkle the shredded mozzarella cheese evenly over the top of the pasta mixture. Bake in the preheated oven for 20-25 minutes, or until the cheese is melted and bubbly and the top is lightly golden brown.
Step 7: Garnish and Serve: Remove from the oven and let stand for a few minutes before garnishing with chopped fresh parsley, if desired. Serve hot and enjoy.
Optional Tips: For a richer flavor, use half-and-half instead of heavy cream, or add cream cheese to the Alfredo sauce. To add vegetables, stir in cooked broccoli florets, spinach, or peas with the pasta and chicken. For a spicy kick, add a pinch of red pepper flakes to the Alfredo sauce. Chicken thighs can be used instead of chicken breasts.