01 -
Preheat the oven to 350°F (175°C) and lightly grease a 9×13-inch baking dish with nonstick spray.
02 -
In a large mixing bowl, combine cooked penne pasta, shredded chicken, sour cream, ranch seasoning mix, Alfredo sauce, cream of chicken soup, and 1 cup mozzarella cheese. Stir until evenly blended.
03 -
Spread the prepared mixture evenly into the greased baking dish, ensuring full distribution to the edges.
04 -
Cover the dish with aluminum foil and bake on the center rack for 25 minutes.
05 -
Remove foil, evenly sprinkle remaining 1 cup mozzarella cheese, chopped bacon, and green onions over the top. Return to oven uncovered and bake an additional 20 minutes until cheese is melted and golden.
06 -
Let casserole rest for 5–10 minutes to set before slicing and serving.