"Here's what you need: russet potato, onion, unsalted butter, shredded cheddar cheese, sour cream, salt, pepper, all-purpose flour, warm water, olive oil, large egg, fresh sage leaf..."
INGREDIENTS
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1 pound russet potatoes, peeled and halved
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1 cup chopped onions
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6 tablespoons unsalted butter, divided
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½ cup shredded cheddar cheese
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¼ cup sour cream
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1 teaspoon salt, plus more to taste
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1 teaspoon pepper, plus more for serving
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1½ cups all-purpose flour, plus more for dusting
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⅓ cup warm water
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1 tablespoon olive oil
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1 large egg, lightly beaten
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10 fresh sage leaves