Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch cubes and chop the broccoli, bell pepper, and zucchini into uniform, bite-sized pieces.
In a small mixing bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, oregano, garlic powder, sea salt, and black pepper.
Place the chicken and vegetables on the prepared baking sheet and drizzle the lemon-herb mixture over the top, tossing thoroughly to coat.
Spread the ingredients into a single layer, ensuring they are not overcrowded to allow for proper roasting and a light golden char.
Bake for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender and fragrant.