Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Slice the carrots into thin rounds and break the broccoli into bite-sized florets.
Cut the chicken breast into even 1-inch cubes to ensure they cook at the same rate as the vegetables.
Place the chicken, broccoli, and carrots in a large mixing bowl.
Mince the garlic cloves and add them to the bowl along with the olive oil, rosemary, thyme, sea salt, and black pepper.
Toss everything together until the chicken and vegetables are thoroughly and evenly coated in the oil and herbs.
Spread the mixture in a single layer on the prepared baking sheet, ensuring nothing is overcrowded so the vegetables roast rather than steam.
Roast in the oven for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized at the edges.
Remove from the oven and let rest for 2 minutes before serving warm.