In a large bowl mix the hash brown potatoes, half of the shredded cheddar cheese, chopped onion, sour cream, and chicken broth. In a small saucepan melt 1/2 cup of butter. When the butter is melted add crushed corn flakes.
Pour potatoes in a 9 x 13-inch baking dish, sprinkle with remaining cheese. Spread the melted butter and cornflake crust ton top of the potato and cheese mixture. Cover dish with aluminum foil. Bake for 60 minutes or until the topping becomes golden brown. Remove from oven and let stand for 15 minutes before serving to all the cheese to congeal before serving.