Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel the sweet potato and cut it into 1-inch cubes, then prepare the carrots and broccoli florets.
In a small mixing bowl, whisk together the extra virgin olive oil, fresh lemon juice, dried rosemary, garlic powder, sea salt, and black pepper.
Place the chicken breast and chopped vegetables onto the prepared baking sheet and pour the herb oil mixture over them.
Toss everything thoroughly with your hands or tongs to ensure the chicken and produce are evenly coated, then spread them out in a single layer.
Roast in the center of the oven for 22-25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy.
Plate the chicken alongside the roasted vegetables and drizzle any remaining pan juices over the top before serving.