Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel the sweet potato and carrots, then dice them into uniform 1-inch cubes to ensure even roasting.
Mince the garlic cloves finely.
In a large mixing bowl, combine the chicken breast, diced sweet potato, and sliced carrots.
Drizzle the olive oil over the chicken and vegetables, then add the minced garlic, rosemary, thyme, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are well-coated with the oil and herb mixture.
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 root vegetables are tender and slightly browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it moist and flavorful.