INGREDIENTS
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1 sheet frozen puff pastry, thawed, cut into 4 squares
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2 tablespoons unsalted butter
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1/2 onion, chopped
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1 cup frozen peas and carrots
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1/2 teaspoon dried thyme
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1 tablespoon all-purpose flour
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1 1/2 cups low-sodium chicken broth
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1 teaspoon Dijon mustard
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1 1/2 cups cubed cooked boneless, skinless chicken
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Salt
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1 large egg, lightly beaten