Preheat your air fryer to 375°F (190°C).
In a large bowl, combine the zucchini, bell pepper, mushrooms, onion, carrot, broccoli, and cauliflower.
Drizzle with olive oil and season with Italian seasoning, garlic powder, sea salt, and black pepper.
Toss until every vegetable is evenly coated.
Arrange the vegetables in a single layer inside the air fryer basket. Avoid overcrowding for the crispiest Air Fryer Vegetables.
Cook for 10–15 minutes, shaking or tossing halfway through cooking. Around 12 minutes is ideal for crisp-tender vegetables.
Repeat with the remaining vegetables.
Transfer to a serving dish.
Squeeze fresh lemon juice over the vegetables.
Garnish with Parmesan cheese and fresh parsley if desired. Serve immediately.