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 even roasting.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the chicken breast, diced vegetables, olive oil, garlic, herbs, sea salt, and black pepper.
Toss the ingredients thoroughly until the chicken and vegetables are evenly coated in the herb oil.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the pieces are not overcrowded.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays moist.