Preheat the oven to 350º. Spray a 9x13 inch baking dish with nonstick cooking spray.
Melt the 1/2 cup butter in a large bowl. Add the cream of chicken soup, sour cream, cheese and onions and mix to combine. Stir in the hash browns. Spread into the prepared baking dish.
Sprinkle the corn flakes evenly on top of the potatoes. Drizzle the 2 tablespoons butter over the top.
Bake in the preheated oven. For shredded hash browns, bake about 30 minutes. For cubed hash browns, bake for 55-60 minutes.
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Notes
Nutrition information provided as an estimate only. Various brands and products can change the counts.