Cheddar Cheese and Potato Pierogi

(United States)
Serves 4 to 8 (makes about 40 dumplings)
INGREDIENTS
For the Dough
2 cups unbleached all-purpose flour, plus some extra for dusting
2 tablespoons unsalted butter, melted
1 large egg, beaten
¼ cup warm water
3 tablespoons sour cream
½ teaspoon salt
For the Filling
2 medium baking potatoes, such as russet
1 large egg yolk
2 tablespoons unsalted butter or bacon fat
1 teaspoon salt (omit [...]

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