Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel and chop the carrot, parsnip, and sweet potato into uniform 1-inch cubes to ensure even cooking.
Finely mince the garlic cloves and roughly chop the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the cubed root vegetables and the chicken breast.
Drizzle with extra virgin olive oil and sprinkle with the minced garlic, fresh herbs, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are well-coated in the oil and aromatics.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the chicken has enough space around it to roast properly.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and golden-brown.
Remove from the oven and let the chicken rest for 5 minutes before slicing it into strips.
Plate the sliced chicken alongside the roasted vegetables and serve immediately.