Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel the carrots, parsnips, and sweet potato, then chop them into uniform 1-inch pieces to ensure even cooking.
Mince the garlic clove finely.
In a large mixing bowl, combine the chopped vegetables and the chicken breast.
Drizzle with extra virgin olive oil and sprinkle with dried rosemary, dried thyme, sea salt, black pepper, and minced garlic.
Toss everything thoroughly until the chicken and vegetables are well-coated in the oil and herbs.
Spread the mixture in a single layer on the prepared baking sheet, 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 root vegetables are tender and slightly caramelized.
Remove from the oven and let the chicken rest for 5 minutes before slicing into strips.
Serve the sliced chicken alongside the roasted root vegetables.