Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel the sweet potato and carrots, then dice them into uniform 1-inch cubes to ensure even cooking.
Place the chicken breast, sweet potato cubes, and carrots in a large mixing bowl.
Drizzle the olive oil over the chicken and vegetables, then sprinkle with rosemary, thyme, garlic powder, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and spice mixture.
Spread the ingredients in a single layer on the prepared baking sheet, ensuring they 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 keep it juicy.