INGREDIENTS
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.Dough:
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2 cups unbleached all-purpose flour (recommended: King Arthur brand)
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1/2 teaspoon salt
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1 large egg
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1/2 cup sour cream
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1/4 cup butter, room temperature
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Filling:
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1 cup warm mashed potato
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1 cup sharp cheddar cheese, shredded
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To Finish:
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1/4 cup butter
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2 large shallots, diced; OR one medium onion, thinly sliced