Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast, sweet potato, and red bell pepper into uniform 1-inch cubes to ensure even cooking.
Place the chicken, sweet potato, bell pepper, and broccoli florets onto the prepared baking sheet.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Drizzle the lemon-herb mixture over the chicken and vegetables, tossing thoroughly with your hands or tongs to coat every piece.
Spread the ingredients out into a single layer, ensuring they aren't overcrowded so they roast rather than steam.
Bake 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 rest for 2 minutes before serving to allow the juices to redistribute.