INGREDIENTS
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5 pounds red potatoes, chopped into equal size pieces
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1/3 milk (more as needed)
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1/2 cup sour cream
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1 and 1/2 teaspoons salt
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3/4 teaspoon pepper
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2 cloves garlic, minced
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1 and 1/2 teaspoon onion powder
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2-3 tablespoons fresh parsley, chopped (or 2 teaspoons dried)
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1/3 cup Parmesan, grated
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1 to 5 teaspoons horseradish sauce (taste it!)
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3/4 cup (1 and 1/2 sticks) butter