Preheat the Air Fryer: Set your air fryer to 400°F (200°C) and let it preheat while you prepare the ingredients.
Prepare the Ingredients: Chop the chicken breasts and vegetables into bite-sized pieces. Mince the garlic and set everything aside.
Season the Chicken and Vegetables: In a large bowl, combine the chicken pieces, broccoli, zucchini, bell pepper, onion, and garlic. Drizzle with olive oil and sprinkle with Cajun seasoning, Italian seasoning, salt, pepper, and optional red chili flakes. Toss well to coat evenly.
Cook in the Air Fryer: Place the seasoned chicken and vegetables in the air fryer basket in a single layer. Depending on the size of your air fryer, you may need to cook in batches. Air fry for 12–15 minutes, shaking the basket halfway through to ensure even cooking.
Check for Doneness: Ensure the chicken is fully cooked (internal temperature of 165°F or 74°C) and the vegetables are tender and slightly charred.
Serve and Garnish: Transfer the chicken and vegetables to a serving platter. Sprinkle with freshly chopped parsley before serving.