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 1/2-inch thick rounds or batons for even cooking.
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 thighs and chopped root vegetables on the prepared baking sheet.
Drizzle the garlic-herb oil over the chicken and vegetables, using your hands or a brush to ensure everything is thoroughly and evenly coated.
Spread the ingredients out in a single layer, making sure the chicken pieces are not overlapping.
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 fork-tender and slightly caramelized.
Remove from the oven and let the chicken rest for 5 minutes before serving to keep the juices locked in.