Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Pat the chicken breast completely dry with paper towels to ensure the herbs stick and the meat browns beautifully.
In a small bowl, whisk together the dried rosemary, thyme, garlic powder, sea salt, and black pepper.
Peel and cube the sweet potato into half-inch pieces and slice the carrots into rounds to ensure they cook at the same rate as the chicken.
Arrange the chicken breast, sweet potato cubes, carrots, and broccoli florets in a single layer on the prepared baking sheet.
Drizzle the extra virgin olive oil over the chicken and vegetables, then sprinkle the herb seasoning mixture evenly over everything.
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 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and lightly browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing to allow the juices to redistribute for a moist finish.