INGREDIENTS
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2 tablespoons unsalted butter
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1 medium shallot, finely chopped
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1/4 cup finely diced carrot
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1/4 cup finely diced celery
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Salt and freshly ground pepper
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1 cup plus 2 tablespoons all-purpose flour
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3/4 cup dry white wine
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1 1/4 cups low-sodium chicken broth
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3 cups shredded rotisserie chicken
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2 tablespoons chopped flat-leaf parsley leaves
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1 tablespoon baking powder
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1 tablespoon finely chopped chives
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1 cup buttermilk
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1 large egg, beaten