Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized cubes and chop the broccoli, bell peppers, and zucchini into uniform pieces to ensure even cooking.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper to create the marinade.
Place the chicken and vegetables on the prepared sheet pan and pour the lemon-herb mixture over them, tossing thoroughly with your hands or tongs to coat every piece.
Spread the ingredients out into a single, even layer on the pan, making sure not to overcrowd them so they roast properly rather than steaming.
Bake for 18 to 22 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender with slightly caramelized edges.
Remove from the oven and let rest for 5 minutes before dividing into meal prep containers for the week.