Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and ensure the broccoli, bell peppers, and zucchini are chopped into uniform sizes for even roasting.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper until well combined.
Place the chicken pieces and all the chopped vegetables onto the prepared baking sheet.
Pour the lemon-herb dressing over the chicken and vegetables, then toss thoroughly with your hands or tongs to ensure every piece is evenly coated.
Spread the mixture out into a single layer, ensuring the chicken pieces are not crowded to allow for proper browning.
Roast in the center of the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven and let rest for 2 minutes before serving hot.