Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into bite-sized cubes and chop the broccoli, bell peppers, and zucchini into uniform pieces.
In a small bowl, whisk together the olive oil, lemon juice, minced garlic, dried oregano, 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 well to coat everything evenly.
Spread the mixture in a single layer to ensure even roasting and maximum crispness.
Roast for 20-25 minutes, or until the chicken is cooked through and the vegetables are tender and slightly charred.
Remove from the oven and serve immediately, optionally garnished with fresh parsley or extra lemon zest.