Preheat your oven to 400°F (200°C).
In a small bowl, whisk together the balsamic vinegar, olive oil, honey, minced garlic, Italian seasoning, salt, and pepper.
Place the chicken breasts in a large baking dish. Pour half of the balsamic mixture over the chicken, ensuring it is well coated.
In a separate bowl, combine the cherry tomatoes, zucchini, bell pepper, and red onion. Drizzle the remaining balsamic mixture over the vegetables and toss to coat.
Arrange the vegetables around the chicken in the baking dish.
Bake in the preheated oven for 25-30 minutes, or until the chicken is cooked through (internal temperature should reach 165°F) and the vegetables are tender.
Remove from the oven and let it rest for 5 minutes before slicing the chicken.
Serve the chicken and veggies warm, garnished with fresh basil if desired.