Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel the sweet potato and cut into 1-inch cubes, then slice the carrots into half-inch thick rounds.
Mince the garlic cloves finely.
In a large mixing bowl, combine the sweet potato cubes, carrot rounds, and the whole chicken breast.
Drizzle the olive oil over the chicken and vegetables, then add the minced garlic, rosemary, thyme, sea salt, and black pepper.
Toss everything thoroughly to ensure the chicken and vegetables are evenly coated in the oil and seasonings.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring the chicken has space around it.
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 it into strips to serve alongside the vegetables.