Preheat oven to 350.  Put hash browns into a greased 9 x 13″ pan.  Combine soup, sour cream, cheese and 1/2 cup melted butter.  Gently blend into hash browns.  Combine corn flakes and 2 tablespoons melted butter.  Sprinkle on top of potatoes.  Bake for 30 minutes or until heated through.