Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel and chop the carrots, parsnips, and sweet potato into uniform 1-inch cubes to ensure even roasting.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, chopped rosemary, thyme, sea salt, and black pepper.
Place the chicken breast and chopped root vegetables on the prepared baking sheet, then drizzle with the garlic-herb oil mixture, tossing well to coat every piece.
Spread the ingredients into a single layer, ensuring the chicken is in the center and the vegetables are spaced out to allow for browning.
Roast for 25-30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and golden-brown.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.