INGREDIENTS
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1 cup warm water (110°F)
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2 1/4 teaspoons (1 packet) instant yeast
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4 cups (18 ounces) all-purpose flour, plus more for dusting
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1 medium russet potato (7 to 8 ounces)
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1 stick (4 ounces) unsalted butter, at room temperature
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1/4 cup sugar
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1 1/2 teaspoons kosher salt
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1 teaspoon mustard powder
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2 large eggs, at room temperature
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2 cups (8 ounces) grated sharp cheddar cheese, divided
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2 tablespoons melted butter