Preheat your air fryer to 400°F (200°C) to ensure a crisp finish.
Cut the chicken breast into 1-inch cubes and slice the zucchini, red bell pepper, and red onion into similar bite-sized pieces.
In a large bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Add the chicken, zucchini, bell pepper, cherry tomatoes, and red onion to the bowl, tossing thoroughly to coat every piece in the savory marinade.
Place the mixture in the air fryer basket in a single layer, working in batches if necessary to avoid overcrowding.
Air fry for 12-15 minutes, shaking the basket halfway through, until the chicken is cooked through and the vegetables are tender and slightly charred.
Transfer the meal to a plate and garnish with the crumbled feta cheese before serving.