Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Peel the sweet potato and carrots, then dice them into uniform 1-inch cubes to ensure even cooking.
Place the chicken breast on one side of the sheet pan and the diced vegetables on the other side.
In a small bowl, whisk together the olive oil, rosemary, thyme, sea salt, black pepper, and garlic powder.
Drizzle the herb oil mixture over both the chicken and the vegetables, using your hands or a brush to coat everything thoroughly.
Roast in the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and golden-brown.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy.
Serve the sliced chicken alongside the roasted root vegetables and enjoy immediately.