INGREDIENTS
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1 large egg, lightly whisked
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2 tablespoons sour cream
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1 cup whole milk
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1 cup water, room temperature
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5 cups all-purpose flour, plus more for surface and dusting
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Yellow cornmeal, for dusting
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5 pounds (about 12 medium) peeled and quartered Yukon gold potatoes
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2 teaspoons coarse salt
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8 ounces room-temperature cream cheese OR Velveeta/American cheese
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4 tablespoons melted unsalted butter
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Scant 1 teaspoon freshly ground pepper
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2 sticks unsalted butter
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Coarse salt