Preheat the grill to medium heat.
In a mixing bowl, combine BBQ sauce, honey, garlic powder, onion powder, salt, and pepper. Mix well.
Coat the chicken breasts with the honey BBQ mixture, ensuring they are well covered. Allow to marinate for at least 10 minutes while preparing the vegetables.
In a separate bowl, toss the sliced zucchini, bell pepper, red onion, and cherry tomatoes with olive oil, salt, pepper, and Italian seasoning (if using).
Place the marinated chicken breasts on the grill and cook for about 6-7 minutes per side, or until the internal temperature reaches 165°F (75°C).
At the same time, grill the vegetables in a grill basket or on skewers for about 8-10 minutes until they are tender and have grill marks, turning occasionally.
Once the chicken is cooked, remove it from the grill and let it rest for a few minutes.
Serve the honey BBQ chicken on a platter, accompanied by the grilled veggie medley.