Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel and chop the carrots and parsnips into uniform 1-inch chunks to ensure even roasting.
Mince the garlic and finely chop the fresh rosemary and thyme leaves.
In a mixing bowl, toss the carrots and parsnips with 0.5 tablespoon of olive oil and half of the garlic and herbs.
Rub the chicken breast with the remaining 0.5 tablespoon of olive oil, the rest of the garlic and herbs, sea salt, and black pepper.
Spread the vegetables onto the prepared baking sheet and place the chicken breast in the center.
Roast for 25-30 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 before slicing to keep it juicy.
Plate the sliced chicken alongside the roasted root vegetables and serve immediately.