Cover greased 9x13 baking pan with frozen hash-browns. Combine soup, margarine (stick), cheese, sour cream and onion in saucepan. Heat until blended.
Pour over hash-browns. Combine cornflake crumbs with melted margarine (2T). Spread cornflake mixture on top of hash-brown mixture.
Cover. Bake at 350 degrees for 1 hour. Uncover and continue to bake for an additional 15 minutes until brown on top.
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