Set oven to 350°F (175°C). Grease a 9×13-inch baking dish.
Mix the base:
In a large bowl, combine cream of chicken soup, sour cream, shredded chicken, 1 cup cheese, onion, salt, and pepper. Mix until well combined.
Add hashbrowns:
Gently fold in the frozen hashbrowns until evenly coated with the creamy mixture.
Assemble the casserole:
Transfer the mixture to the prepared baking dish. Spread evenly. Drizzle melted butter on top and sprinkle with additional cheese. Add optional crushed cornflakes or breadcrumbs for a golden, crunchy topping.
Bake:
Bake uncovered for 45–50 minutes, or until the casserole is bubbly and the top is golden brown.
Serve hot:
Let the casserole sit for 5 minutes before serving. Perfect alongside a simple salad or steamed vegetables.
🍽️ Serving Suggestions
Pair with a fresh garden salad for a lighter balance.
Serve with steamed broccoli or green beans to add some green to your plate.
Great for potluck meals or family gatherings, as it’s easy to transport and reheat.