Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper for easy cleanup.
Peel the sweet potato and dice it into uniform 1/2-inch cubes, and chop the broccoli into bite-sized florets.
Place the chicken breast, sweet potato cubes, and broccoli florets onto the prepared sheet pan.
Drizzle the extra virgin olive oil over the chicken and vegetables, then sprinkle evenly with sea salt, black pepper, garlic powder, and dried rosemary.
Use your hands or tongs to toss the vegetables until well-coated, and flip the chicken to ensure it is seasoned on both sides.
Spread the ingredients out into a single layer, ensuring the chicken has space around it to roast properly.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165 °F and the sweet potatoes are tender with golden-brown edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure the juices stay locked in.