INGREDIENTS
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1/2 cup (1 stick) chilled unsalted butter, divided
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1 pound skinless, boneless chicken thighs, cut into 3/4-inch pieces
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3/4 medium onion, chopped
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2 celery stalks, chopped
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1/2 teaspoon kosher salt, plus more
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1/4 teaspoon freshly ground black pepper, plus more
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1/4 cup sauerkraut
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1/4 acorn squash, seeds removed, cut into 3/4-inch pieces
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2 tablespoons plus 1 cup all-purpose flour; plus more for surface
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1 cup plus 2 tablespoons whole milk
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1 large egg yolk