Chicken Pan Pie
Ingredients:
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¼ cup unsalted butter
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⅔ cup diced onion
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½ teaspoon kosher salt, or to taste
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1 ½ pounds boneless, skinless chicken thighs, cut into 1-inch pieces
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¼ cup all-purpose flour
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2 ½ cups chicken broth
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½ cup sliced carrots
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½ cup sliced celery
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¼ teaspoon freshly ground black pepper
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1 pinch cayenne pepper
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½ cup frozen peas, thawed
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1 teaspoon fresh thyme leaves
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1 recipe pastry pie dough
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1 large egg, beaten
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2 teaspoons water