Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel the carrots and parsnips, then slice them into 1-inch thick rounds or chunks to ensure they cook evenly.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
Place the chicken breast and chopped root vegetables on the prepared baking sheet, then drizzle everything with the extra virgin olive oil.
Scatter the minced garlic, rosemary, thyme, sea salt, and black pepper over the chicken and vegetables, tossing thoroughly to coat.
Arrange the chicken in the center and spread the vegetables in a single layer around it to allow for proper roasting.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly caramelized.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted roots.