01 -
Preheat the oven to 350 degrees F (175 degrees C) and gather all ingredients.
02 -
In a large bowl, mix hash browns, shredded Cheddar cheese, condensed soup, sour cream, ½ cup of melted butter, chopped onion, salt, and ground black pepper.
03 -
Spread the mixture evenly into a 3-quart casserole dish.
04 -
In a saucepan over medium heat, combine remaining ¼ cup melted butter with crushed cornflakes, stirring gently to coat.
05 -
Sprinkle the cornflake mixture evenly over the top of the casserole.
06 -
Cover the casserole and bake in the preheated oven for about 40 minutes, or until hot and the topping is crispy.
07 -
Remove from the oven, let cool slightly, and serve.