Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel the carrots and parsnips, then slice them into uniform 1-inch chunks to ensure even cooking.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the chicken breast, chopped carrots, and parsnips.
Add the minced garlic, chopped herbs, sea salt, and black pepper to the bowl.
Drizzle the extra virgin olive oil over the mixture and toss thoroughly until the chicken and vegetables are evenly coated.
Spread the ingredients in a single layer on the prepared baking sheet, ensuring they are not overcrowded.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and caramelized.
Remove from the oven and allow the chicken to rest for 5 minutes before slicing to ensure maximum juiciness.