01 - Arrange the sliced onions, minced garlic, bell pepper strips, and halved cherry tomatoes in an even layer across the bottom of the slow cooker.
02 - Place the chicken breasts on top of the bed of vegetables in the slow cooker.
03 - In a small mixing bowl, whisk together the balsamic vinegar, chicken broth, honey or maple syrup, Dijon mustard, dried oregano, dried basil, salt, and black pepper until fully combined.
04 - Pour the balsamic sauce evenly over the chicken and vegetables, ensuring everything is well coated.
05 - Cover the slow cooker and cook on the low setting for 4 to 6 hours, until the chicken is tender and reaches an internal temperature of 165°F.
06 - Remove the chicken and vegetables from the slow cooker, garnish with chopped fresh parsley, and serve hot alongside rice, potatoes, or steamed vegetables.