Preheat the oven to 350 degrees Fahrenheit. Cook the 16 ounces uncooked penne pasta according to package directions. Drain, rinse, and set it aside.
In a medium saucepan, over medium-high heat, add ½ cup unsalted butter, 2 cups heavy whipping cream, and 4 ounces cream cheese. Cook until melted. Add the ½ teaspoon minced garlic, 1 teaspoon garlic powder, 1 teaspoon Italian seasoning, ¼ teaspoon salt, and ¼ teaspoon pepper. Continue to whisk until smooth.
Add the 1 cup grated parmesan cheese. Bring the sauce to a simmer and continue to cook for about 3-5 minutes or until it starts to thicken.
Add the cooked pasta back to the pot and pour the Alfredo Sauce over it. Then add in the 2 cups cooked chicken, and stir everything together.
Add HALF of the pasta mixture to a 9x13 baking dish and top with HALF of the 2 cups mozzarella. Then, add the rest of the pasta mixture to the dish and top with the remaining mozzarella and ¼ cup parmesan.
Bake for 20-30 minutes until the cheese is golden and bubbly. Remove the dish from the oven and let it rest for 5 minutes before serving.
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Notes
Updated May 13, 2025Leftover Instructions
In the Refrigerator: Once the chicken alfredo has cooled, you can place it in an airtight container in your fridge. It will last for up to 3 days.
In the Freezer: Store leftovers in individual portion sizes in freezer-safe containers for up to 2 months. Thaw in the fridge overnight before heating.
Reheat: To reheat leftovers, you can heat them up in the microwave for 30 seconds to a minute at a time until they are warmed through.