Preheat oven to 400°F and line a large baking sheet with parchment paper.
Peel and chop the sweet potato and carrots into uniform 1-inch cubes for even cooking.
Mince the garlic cloves finely.
In a large mixing bowl, combine the chicken breast, chopped vegetables, olive oil, minced garlic, rosemary, thyme, salt, and pepper.
Toss everything thoroughly until the chicken and vegetables are well-coated with the oil and herbs.
Spread the mixture in a single layer on the prepared baking sheet, ensuring space between pieces.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F.
Let the chicken rest for 5 minutes before slicing to ensure it stays juicy.