INGREDIENTS
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1/2 cup sour cream
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1/2 cup mayonnaise
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1 tablespoon brown mustard
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1/2 teaspoon horseradish
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Peanut oil, for frying
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4 cups left-over mashed potatoes
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1 large egg
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1/2 cup all-purpose flour
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1 tablespoon brown mustard
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1 cup crushed pretzels