Old-Fashioned Maine Potato Doughnuts
INGREDIENTS
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3 tablespoons unsalted butter, softened
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3/4 cup granulated sugar
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1 large egg, at room temperature
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1 1/2 teaspoons vanilla extract
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1 cup lightly packed mashed russet or Yukon Gold potatoes (see “Additional Notes,” below)
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1/4 cup buttermilk, at room temperature
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2 cups all-purpose flour, plus more for work surface
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1 teaspoon baking powder
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1 teaspoon baking soda
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1/2 teaspoon table salt
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1/2 teaspoon freshly grated nutmeg
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Vegetable shortening or vegetable oil for frying (see “Additional Notes,” below)
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Cinnamon sugar, for dusting (optional)
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