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Instructions
Preheat the oven to 375 degrees F (190 degrees C).
Mix together hash brown potatoes, sour cream, onion, cream of chicken soup, Colby cheese, and melted butter in a bowl until well combined; season with salt and black pepper. Transfer mixture to a 9x13-inch baking dish and sprinkle the top with cornflake crumbs.
Bake in the preheated oven until casserole is bubbling, about 1 hour.