Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel and dice the sweet potato and carrots into uniform 1-inch cubes to ensure they roast evenly.
Mince the garlic clove and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the chicken breast, diced vegetables, olive oil, minced garlic, rosemary, thyme, salt, and pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated with the herb oil.
Spread the mixture onto the prepared baking sheet in a single layer, placing the chicken breast in the center.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the root vegetables are fork-tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it remains juicy and flavorful.