Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel and slice the carrots and parsnips into 1/2-inch thick rounds to ensure they roast evenly with the chicken.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, chopped rosemary, and chopped thyme.
Place the chicken breast, carrots, and parsnips on the prepared baking sheet, then drizzle with the herb oil and season with sea salt and black pepper.
Toss everything thoroughly with your hands or tongs to ensure every piece is well-coated in the aromatic oil and spices.
Arrange the chicken in the center and spread the vegetables in a single layer around it to allow for proper air circulation.
Roast for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are golden and fork-tender.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted root vegetables.