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 1/2-inch cubes, and chop the broccoli into bite-sized florets.
Place the chicken breast, cubed sweet potatoes, and broccoli florets onto the prepared baking sheet.
Drizzle the olive oil over the chicken and vegetables, then sprinkle evenly with sea salt, black pepper, oregano, garlic powder, and smoked paprika.
Toss the vegetables with your hands or a spatula to coat them thoroughly, and rub the seasoning mixture into both sides of the chicken breast.
Spread everything out into a single layer, ensuring the chicken is not covered by the vegetables.
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 sweet potatoes are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it remains juicy.