Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Peel the carrots and parsnips, then slice them into half-inch thick rounds; peel the red onion and cut it into thick wedges.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, rosemary, thyme, sea salt, and black pepper.
Place the chicken breast and the prepared vegetables onto the baking sheet, ensuring they are not overcrowded.
Drizzle the herb oil mixture over the chicken and vegetables, tossing everything thoroughly with your hands to ensure an even coating.
Spread the vegetables out in a single layer around the chicken breast to ensure they caramelize properly.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to maintain its juiciness.