INGREDIENTS
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4 tablespoons butter
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1 onion, chopped
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Salt and pepper, to taste
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4 cloves garlic, minced
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2 teaspoons dried thyme
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2 tablespoons flour, plus more for dusting
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1 cup white wine
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2 cups chicken stock
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2 teaspoons Dijon mustard
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2 cups frozen peas and carrots
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2 cups cubed or shredded cooked chicken
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2 sheets (1 package) frozen puff pastry, thawed
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1 egg