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Ingredients

• 3 1/2 pounds russet potatoes , peeled and cut into ¾-inch dice
• 1/2 teaspoon baking soda
• 3 tablespoons unsalted butter , cut into 12 pieces
• Kosher salt and pepper
• Pinch cayenne pepper
• 3 tablespoons vegetable oil
• 2 onions , cut into ½-inch dice
• 3 tablespoons minced fresh chives