INGREDIENTS
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4 tbsp. unsalted butter
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1 medium carrot, peeled and diced (1/2 cup)
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2 ribs celery, diced (1/2 c.)
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1 small onion, diced (1 c.)
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1 clove garlic, minced
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1 tbsp. thyme leaves
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kosher salt
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Black pepper
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1/4 c. all-purpose flour
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1/4 c. dry white wine
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3 c. chicken stock
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2 c. rotisserie chicken
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3 c. baby spinach
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1 sheet frozen puff pastry, thawed
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1 egg