Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Wash and peel the sweet potato, then dice it into 1/2-inch cubes to ensure even cooking.
Cut the broccoli into bite-sized florets, keeping them uniform in size.
Place the chicken breast, sweet potato cubes, and broccoli florets on the prepared sheet pan in a single layer.
Drizzle the olive oil over the chicken and vegetables, then sprinkle evenly with rosemary, thyme, garlic powder, sea salt, and black pepper.
Toss the vegetables with your hands or tongs to coat them thoroughly in the oil and spices, and rub the seasoning into both sides of the chicken.
Roast in the center of the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender and golden.
Remove from the oven and allow the chicken to rest for 5 minutes before slicing to ensure it remains juicy and flavorful.