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Let hash browns thaw for 1/2 hour. Mix 1/4 cup butter with sour cream, soup and cheese.
Sprinkle hash browns in a greased 9x13 inch baking dish. Sprinkle with onion. Melt margarine.
Put hashbrowns in crock pot. Mix soups and sour cream together. Pour over hash browns. Cut up margarine and stir into hashbrowns.