Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Prepare the vegetables by cutting the broccoli into bite-sized florets, slicing the bell peppers into strips, and cutting the carrots into thin rounds.
Place the chicken breast in the center of the baking sheet and surround it with the prepared vegetables.
Mince the garlic and whisk it together with the olive oil, rosemary, thyme, sea salt, and black pepper in a small bowl.
Drizzle the herb oil over the chicken and vegetables, using your hands or a brush to ensure everything is evenly coated.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly caramelized.
Remove from the oven and let the chicken rest for 5 minutes before slicing against the grain to maintain juiciness.
Plate the sliced chicken alongside the roasted vegetables and serve immediately.