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 chop the broccoli, bell pepper, and zucchini into uniform sizes to ensure even cooking.
In a large mixing bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper.
Add the chicken pieces and chopped vegetables to the bowl, tossing thoroughly until every piece is coated in the zesty herb marinade.
Spread the mixture in a single layer across the prepared baking sheet, making sure not to overcrowd the pan so the vegetables roast rather than steam.
Roast for 18-22 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the vegetables are tender with slightly caramelized edges.