Preheat your oven to 400°F (200°C).
In a mixing bowl, combine the balsamic vinegar, zesty Italian dressing, garlic powder, Italian seasoning, and olive oil. Whisk until well blended.
Add the chicken tenderloins to the marinade, ensuring they are fully coated. Let them sit for about 15-20 minutes.
While the chicken marinates, chop the broccoli into florets and cut the baby carrots in half if they are larger. Halve the cherry tomatoes.
Spray your large baking sheet with cooking spray. Arrange the marinated chicken in the center and scatter the broccoli, carrots, and cherry tomatoes around it.
Drizzle any remaining marinade over the veggies and chicken. Season with salt and pepper if desired. Roast in the preheated oven for 25-30 minutes or until the chicken is cooked through and the veggies are tender.
Once cooked, remove from the oven and let it cool for a few minutes. Garnish with fresh parsley if desired, then serve and enjoy!