"“What a tasty gift to the family: chicken packaged in a flaky, golden wrapper.”..."
INGREDIENTS
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6 large boneless, skinless chicken-breast halves
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3/4 teaspoon salt, divided
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1/4 teaspoon pepper, divided
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4 tablespoons butter, divided
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12 ounces mushrooms, finely chopped
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1/2 cup finely chopped onion
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2 tablespoons port wine, optional
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1 teaspoon dried thyme
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1 (17 1/4-ounce) package frozen puff pastry, thawed
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1 large egg, separated
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1 tablespoon Dijon mustard
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1 teaspoon milk