Step 1: Preheat the oven to 400°F (200°C) for perfect roasting.
Step 2: Spray a large baking sheet with cooking spray to prevent sticking.
Step 3: In a mixing bowl, combine balsamic vinegar, zesty Italian dressing, olive oil, garlic powder, Italian seasoning, salt, and pepper. Add chicken and toss to coat. Marinate for 10-15 minutes.
Step 4: While marinating, cut broccoli into florets, and wash baby carrots and cherry tomatoes.
Step 5: Arrange marinated chicken on the baking sheet, surround with broccoli, carrots, and tomatoes. Drizzle any leftover marinade over the veggies.
Step 6: Roast in the oven for 25-30 minutes until chicken is cooked through and veggies are tender. Broil for 2-3 minutes for caramelization if desired.
Step 7: Remove from oven, garnish with parsley if desired, and serve immediately.
