Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Peel and dice the sweet potato into 1/2-inch cubes, chop the broccoli into bite-sized florets, and slice the bell pepper into strips.
Place the chicken breast in the center of the baking sheet and arrange the prepared vegetables in a single layer around it.
Drizzle the olive oil over the chicken and vegetables, then sprinkle evenly with sea salt, black pepper, rosemary, thyme, and garlic powder.
Toss the vegetables with your hands or tongs to ensure they are well-coated with the oil and spices.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays moist and tender.