Begin by preheating your oven to 350°F (175°C) to ensure it's ready for baking.
In a large skillet, heat the olive oil over medium heat. Once hot, add the minced garlic and sauté for about 1 minute or until it becomes fragrant.
Lower the heat to low and carefully pour in the heavy cream. Stir in the Italian seasoning, along with salt and pepper to taste. Allow this mixture to simmer gently for about 2-3 minutes, stirring occasionally.
Gradually whisk in the grated Parmesan cheese, stirring continuously until the cheese completely melts and integrates into the sauce, resulting in a smooth and creamy consistency.
In a large mixing bowl, combine the cooked fettuccine pasta and shredded chicken. Pour the creamy Alfredo sauce over the pasta and chicken mixture. Stir well to ensure that all the ingredients are evenly coated with the sauce.
Lightly grease a 9x13 inch baking dish. Carefully transfer the pasta and chicken mixture into the dish, spreading it out evenly. Sprinkle the shredded mozzarella cheese generously over the top.
Cover the baking dish tightly with aluminum foil. Place it in the preheated oven and bake for 20 minutes. After this time, remove the foil and continue baking for an additional 10-15 minutes, or until the mozzarella cheese is bubbly and has developed a light golden color.
Once baked to perfection, carefully remove the dish from the oven and let it rest for about 5 minutes.
Just before serving, sprinkle freshly chopped parsley over the top of the dish for a vibrant touch and enhanced flavor.
Notes
Serve in individual bowls with extra Parmesan cheese and a drizzle of olive oil for added richness.