Dinner Recipe: Braised French Onion Chicken with Gruyère

Name: Dinner Recipe: Braised French Onion Chicken with Gruyère
Ingredients: 3 tablespoons unsalted butter; 2 pounds yellow onions, thinly sliced; 1/8 teaspoon baking soda; Kosher salt and freshly ground black pepper; 1 tablespoon olive oil; 3 pounds boneless, skinless chicken thighs; 2 cups low-sodium chicken or beef broth, divided; 2 tablespoons Dijon mustard; 1 tablespoon balsamic vinegar; 2 to 4 cloves garlic, thinly sliced; 2 fresh thyme sprigs; 1 (4-inch) fresh rosemary sprig; 1 1/2 cups shredded Gruyère cheese (about 5 ounces); Coarsely chopped fresh parsley, for garnish (optional)