Preheat oven to 350 degrees. Mix hash browns, cheese, salt, and pepper in a large bowl.
Heat butter, soup, sour cream, and milk in a saucepan until butter is melted.
Stir heated sauce into hash browns.
Pour mixture into a 9x13 baking dish.
Top with corn flakes and a little melted butter.
Bake for 1 hour.
