Preheat the grill to medium-high heat.
In a mixing bowl, combine the honey BBQ sauce, olive oil, garlic powder, onion powder, salt, and pepper. Mix well to create a marinade.
Add the chicken breasts to the bowl, ensuring they are completely coated in the marinade. Allow them to marinate for at least 10 minutes (or up to 2 hours in the refrigerator for more flavor).
While the chicken is marinating, prepare the veggies. In another bowl, toss the sliced zucchini, chopped bell peppers, and red onion with olive oil, Italian seasoning, salt, and pepper.
Place the marinated chicken on the grill and cook for about 6-7 minutes on each side or until the internal temperature reaches 165°F (75°C).
After flipping the chicken for the first time, add the prepared vegetables to the grill. Grill them for about 5-7 minutes or until they are tender and have nice grill marks.
Once the chicken and veggies are done, remove them from the grill and let the chicken rest for a few minutes before slicing.
Serve the sliced honey BBQ chicken alongside the grilled veggie medley for a colorful and satisfying meal.