Serves 10 | Total Cook Time: 1 hour
1 large egg
2 tablespoons sour cream
1 cup whole milk
1 cup water
Roughly 4 cups flour, plus more for dusting
5 pounds baking potatoes, peeled and cubed
1.5 sticks unsalted butter, melted
1 cup grated white cheddar cheese
1 package cream cheese
Salt and pepper, to taste