Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Pat the chicken breast dry with a paper towel to ensure the surface achieves a beautiful golden-brown sear.
In a large mixing bowl, toss the cubed sweet potatoes, broccoli florets, sliced bell peppers, and red onion with half of the olive oil.
Place the chicken breast on the prepared baking sheet and rub with the remaining olive oil, rosemary, thyme, garlic powder, sea salt, and black pepper.
Arrange the seasoned vegetables in a single layer around the chicken on the sheet pan, ensuring they are not overcrowded to allow for even roasting.
Roast in the center of the oven 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 allow the juices to redistribute for maximum tenderness.
Serve the sliced herb chicken alongside the roasted vegetables for a balanced and clean-eating meal.