Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Cut the chicken breast into uniform 1-inch cubes to ensure even cooking.
In a large mixing bowl, combine the cubed chicken, broccoli florets, chopped bell pepper, and sliced zucchini.
Drizzle the extra virgin olive oil over the chicken and vegetables, then sprinkle with oregano, garlic powder, onion powder, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are well-coated in the oil and spices.
Spread the mixture in a single layer on the prepared baking sheet, making sure not to overcrowd the pan so the vegetables roast rather than steam.
Roast for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with caramelized edges.
Let the dish rest for 2 minutes before serving to allow the juices in the chicken to redistribute.