Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Wash and scrub the potato, carrots, and parsnips, then chop them into uniform 1-inch chunks for even cooking.
Mince the garlic clove and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the chopped root vegetables and the chicken breast.
Drizzle with olive oil and sprinkle with the minced garlic, rosemary, thyme, sea salt, and black pepper.
Toss everything thoroughly to ensure the chicken and vegetables are well-coated in the oil and herbs.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring the chicken has space around it.
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 golden and tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing and serving alongside the roasted vegetables.