Crispy Baked Chicken with Tomatoes & Caramelized Onions

The onion mixture::

• 1 tablespoon olive oil
• 2 yellow onions cut in half and thinly sliced
• warm water as needed
• ¼ teaspoon ground pepper
• ⅛ teaspoon salt
• 3 garlic cloves minced
• 1 tablespoon balsamic vinegar
• ½ teaspoon ground oregano
• 1 cup canned petite diced tomatoes
• ¼ cup chopped flat-leaf parsley

The Chicken:

• 2 boneless skinless chicken breasts, cut in half lengthwise
• 1 tablespoon olive oil
• ½ cup whole wheat Panko Breadcrumbs
• ¼ cup grated Parmesan cheese
• ¼ teaspoon ground pepper