Leftover mashed potatoes (I use about 5 cooked Idahos peeled and mashed with about 6 tablespoons of melted, unsalted butter and a few tablespoons of milk: if your leftover mashed potatoes contain no butter or milk, add them for this recipe)
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4 oz. cream cheese, softened
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8 oz. sour cream
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1 cup cheddar cheese, shredded
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1/2 cup green onions or chives, sliced/chopped plus extra 2 tablespoons for garnish