Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel the carrots and sweet potato, then dice them into uniform 1-inch cubes to ensure they cook at the same rate.
Finely mince the garlic clove.
In a large mixing bowl, combine the diced vegetables and the chicken breast.
Drizzle the olive oil over the chicken and vegetables, then sprinkle with rosemary, thyme, minced garlic, 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 breast has enough space around it to roast rather than steam.
Place the tray in the oven and roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to lock in the juices.