Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel and chop the carrots and parsnips into 1-inch chunks, and slice the red onion into thick wedges.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, toss the prepared vegetables with half of the extra virgin olive oil, half of the sea salt, and half of the black pepper.
Pat the chicken breast dry with a paper towel and rub with the remaining olive oil, minced garlic, rosemary, thyme, salt, and pepper.
Spread the vegetables in a single layer on the baking sheet and nestle the seasoned chicken breast in the middle.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the root vegetables are tender and lightly caramelized.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure maximum juiciness.