Pre heat over to 375°F

In a large casserole dish put frozen hashbrowns,cream of mushroom soup,3 tablespoons of butter and place in the oven for 55 minutes stirring every 10-15 minutes

After 55 minutes, Place both bags of cheese in casserole and mix together put back in oven until cheese is melted. Once melted place corn flakes on top place back in oven for about 3-5minutes