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Cook potatoes in boiling water in large saucepan 20 min. or until tender; drain. Return to pan.
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Heat oven to 350ºF. Add butter and sour cream to potatoes; mash until smooth. Spoon half into 1-1/2-qt. casserole; cover with layers of cheese, remaining potato mixture and bacon.
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Bake 30 to 35 min. or until heated through.