Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash, peel, and chop the carrots and parsnips into uniform 1-inch chunks to ensure even roasting.
In a mixing bowl, toss the chopped root vegetables with half of the extra virgin olive oil, half of the sea salt, and half of the black pepper.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
Place the chicken breast on the prepared baking sheet. Rub the remaining olive oil, minced garlic, rosemary, thyme, salt, and pepper over both sides of the chicken.
Spread the seasoned vegetables in a single layer around the chicken on the baking sheet.
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 tender and golden brown.
Remove from the oven and let the chicken rest for 5 minutes to lock in the juices before slicing and serving with the roasted vegetables.