INGREDIENTS
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FILLING
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1 pound russet potatoes, peeled and sliced 1/2 inch thick
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Salt and pepper
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4 ounces sharp cheddar cheese, shredded (1 cup)
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2 tablespoons unsalted butter
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DOUGH
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2 1/2 cups (13 3/4 ounces) bread flour
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1 teaspoon baking powder
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Salt
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1 cup sour cream
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1 large egg plus 1 large yolk
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TOPPING
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4 tablespoons unsalted butter
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1 large onion, chopped fine
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1/2 teaspoon salt