Chicken With Caramelized Onions

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Details

9 Ingredients

• Vegetable cooking spray
• 6 cups thinly sliced onion
• 1/2 tsp salt
• 1/4 tsp dried thyme
• 1/4 tsp ground red pepper
• 1/4 tsp black pepper
• 1/2 cup low-salt chicken broth, divided
• 1/4 cup balsamic vinegar
• 6 (4-oz) skinned, boned chicken breast halves