"A foolproof recipe from the pierogi expert herself...."
INGREDIENTS
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8 ounces Yukon Gold potatoes (1 medium or 2 small), cut into 2-inch pieces
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1 tablespoon plus 1/4 teaspoon kosher salt, divided
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1/4 cup finely shredded cheddar cheese (1 ounce)
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1 to 2 tablespoons heavy cream
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1 large egg
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1/2 cup plain Greek yogurt (any fat percentage)
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3 tablespoons unsalted butter, melted and slightly cooled
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1 teaspoon kosher salt
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2 cups unbleached all-purpose flour
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1 large egg
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1 tablespoon water
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4 tablespoons unsalted butter, divided
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Caramelized onions, for serving