INGREDIENTS
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1 whole chicken (3 1/2 to 4 pounds)
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5 tablespoons unsalted butter
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1 pound Yukon gold potatoes, peeled and diced
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3 medium carrots, peeled and diced
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1 medium onion, peeled and diced
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12 ounces cremini mushrooms, trimmed and quartered
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1/3 cup cognac
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5 tablespoons all-purpose flour
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1 cup whole milk
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1 cup fresh or frozen peas
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2 tablespoons chopped fresh flat-leaf parsley
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2 tablespoons fresh thyme leaves
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Coarse salt and freshly ground pepper
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1 1/2 sheets frozen puff pastry, from 2 (14-ounce) boxes, thawed
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1 large egg plus 1 egg yolk