Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel and chop the carrots and parsnips into 1-inch pieces, and cut the red onion into thick wedges.
In a large mixing bowl, combine the chopped vegetables and the chicken breast.
Drizzle with extra virgin olive oil and add the minced garlic, rosemary, thyme, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and herbs.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring the chicken is not covered by the vegetables.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the root vegetables are tender and lightly caramelized.
Remove from the oven and let the chicken rest for 5 minutes before slicing it into strips.
Serve the sliced chicken alongside the roasted vegetables.