INGREDIENTS
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5 skinless, boneless chicken thighs (1Â 1/4 lb.)
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Kosher salt and freshly ground pepper
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1 tablespoon olive oil
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2 leeks, sliced into  1/2â rings
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1 cup homemade chicken stock or low-sodium chicken broth, divided
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1 cup cooked chestnuts, quartered
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2 tablespoons whole grain mustard