Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel and chop the carrots and sweet potato into uniform 1-inch cubes, and slice the red onion into thick wedges.
In a small mixing bowl, whisk together the extra virgin olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Place the chicken breast and the prepared vegetables onto the baking sheet in a single layer.
Drizzle the garlic-herb oil mixture over the chicken and vegetables, using your hands or a brush to ensure everything is thoroughly and evenly coated.
Roast in the center of the oven for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender and slightly caramelized.
Remove from the oven and allow the chicken to rest for 5 minutes before slicing to keep it juicy, then serve immediately with the roasted vegetables.