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-inch thick diagonal chunks.
Mince the garlic clove finely.
In a small bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Place the chicken breast and the chopped root vegetables onto the prepared baking sheet.
Pour the lemon-herb mixture over the chicken and vegetables, using your hands or a brush to ensure everything is thoroughly and evenly coated.
Spread the vegetables out in a single layer around the chicken to ensure they roast rather than steam.
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 slicing to keep it juicy.