INGREDIENTS
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1 large egg
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¾ cup sour cream
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8 Tbsp unsalted butter, softened
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1 Tbsp chopped fresh chives
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1 tsp kosher salt
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2 cups flour, plus more for rolling dough
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2 lb russet potatoes, peeled and cut into large chunks
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Kosher salt and freshly ground pepper
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1 cup hot heavy cream
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8 Tbsp cold butter, cubed
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1 Tbsp olive oil
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1 lb bacon, chopped
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2 large yellow onions, thinly sliced
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1½ cups Gruyère cheese, shredded
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1½ cups farmer's cheese, shredded
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Sour cream, for topping
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Finely chopped chives, for topping