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 dice it into 1/2-inch cubes, then slice the carrots into thin rounds.
Place the chicken breast in the center of the sheet pan and surround it with the sweet potatoes, carrots, and broccoli florets.
Drizzle the olive oil evenly over the chicken and vegetables, ensuring everything is well-coated.
Sprinkle the dried rosemary, thyme, garlic powder, sea salt, and black pepper over the entire tray.
Toss the vegetables with your hands or a spatula to distribute the seasonings, and rub the spices into the chicken.
Roast for 20 to 25 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.