Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel and cut the sweet potato into 1-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.
Sprinkle the sea salt, black pepper, garlic powder, and dried oregano evenly over all components.
Toss the vegetables to coat them in the oil and spices, and flip the chicken to ensure it is seasoned on both sides.
Spread everything out into a single layer to ensure even roasting.
Bake for 20-25 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 stays juicy.