Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into 1-inch bite-sized cubes and chop the broccoli, bell pepper, and zucchini into uniform pieces.
In a small bowl, whisk together the extra virgin olive oil, fresh lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken cubes and chopped vegetables onto the prepared baking sheet.
Pour the lemon-herb dressing over the chicken and vegetables, tossing thoroughly to ensure every piece is well coated.
Spread the mixture out into a single layer, ensuring the pan is not overcrowded to allow for proper roasting.
Roast in the center of the oven for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender and slightly golden.