INGREDIENTS
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2 tablespoons olive oil, divided
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1 large onion, minced
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4 bone-in, skin-less chicken breasts
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1/2 cup minced flat-leaf parsley, plus more for garnish
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1/3 cup salted capers, soaked well in several changes of water
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1 can (14.5 oz)chicken broth
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1/3 cup white wine vinegar
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1 tablespoon cornstarch
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1 tablespoon water
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Freshly ground black pepper
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Salt