Skillet Chicken With Mushrooms And Caramelized Onions

Ingredients

• 5 tablespoons olive oil
• 2 tablespoons plus 2 teaspoons sherry vinegar
• 2 teaspoons honey
• 1 teaspoon Dijon mustard
• ¼ teaspoon red-pepper flakes
• Kosher salt
• black pepper
• 1 ½ pounds boneless, skinless chicken thighs, cut into 3-inch pieces
• 2 medium yellow onions, thinly sliced (about 4 cups)
• ¾ pound cremini mushrooms, stems removed and thinly sliced (about 4 cups)
• ½ cup fresh flat-leaf parsley or dill leaves and fine stems, roughly chopped
• ¼ cup grated Parmesan or pecorino (optional)
• Bread or cooked pasta, for serving
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• PREPARATION
• Add the remaining 2 teaspoons sherry vinegar, stirring and scraping up anything on the bottom of the skillet. Season to taste with salt