Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Peel and chop the carrots, parsnips, and sweet potato into uniform 1-inch chunks to ensure even roasting.
In a large bowl, whisk together the extra virgin olive oil, minced garlic, chopped rosemary, thyme, sea salt, and black pepper.
Add the chicken breast and the chopped root vegetables to the bowl, tossing thoroughly until every piece is coated in the fragrant herb oil.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the chicken has enough space around it to brown properly.
Roast for 25-30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender with caramelized edges.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.