Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Slice the carrots into thin rounds and chop the red bell pepper into bite-sized pieces.
Place the chicken breast, broccoli florets, carrots, and bell peppers onto the prepared baking sheet.
Mince the garlic clove and whisk it together with the olive oil, rosemary, thyme, salt, and pepper in a small bowl.
Drizzle the herb oil over the chicken and vegetables, tossing the vegetables and coating the chicken thoroughly to ensure even seasoning.
Spread everything out into a single layer so the vegetables roast rather than steam.
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.
Allow the chicken to rest for 5 minutes before slicing to keep it juicy, then serve immediately.