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Preheat oven to 350º Fahrenheit. Grease a 9x13 inch casserole dish.
In a large bowl, whisk together cream of chicken soup, softened cream cheese, sour cream, 4 tablespoons melted butter, garlic powder, onion powder, and black pepper until fully combined.
Stir in the thawed hashbrowns and shredded cheese until the mixture is evenly coated. Transfer to the prepared dish and spread evenly.
In a separate bowl, toss crushed cornflakes with the remaining 4 tablespoons of melted butter until fully coated. Sprinkle evenly over the casserole.
Cover with foil and bake for 20 minutes. Uncover and bake for another 15 to 20 minutes, until the potatoes are tender and the topping is golden.