Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and place them in a large mixing bowl.
Add the broccoli florets, sliced red bell pepper, and sliced carrots to the bowl with the chicken pieces.
Mince the garlic cloves and add them to the bowl along with the olive oil, rosemary, thyme, salt, and pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and herb mixture.
Spread the mixture in a single layer on the prepared sheet pan, ensuring nothing is overcrowded to allow for proper browning.
Roast for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized.
Remove from the oven and let the dish rest for 2 minutes before serving warm.