French Onion Chicken with Gruyere - Print Version - Taste Of Cook

Ingredients

• 1 ½ pounds boneless skinless chicken breasts
• ½ cup all-purpose flour
• 1 teaspoon dried thyme, divided
• 1 teaspoon dried rosemary, divided
• 2 teaspoons salt, divided
• ½ teaspoon black pepper
• 2 tablespoons salted butter, divided
• 2 tablespoons olive oil, divided
• 4 small sweet onions (about 2 pounds), thinly sliced
• 3 garlic cloves, finely minced
• 2 cups beef broth, divided
• 2 teaspoons Worcestershire sauce
• 2 teaspoons balsamic vinegar
• 1 tablespoon brown sugar
• 1 cup shredded Gruyere cheese
• Fresh thyme leaves (optional)