Preheat the air fryer to 375°F.

Place the zucchini, red pepper, mushrooms, onion, carrot, broccoli, and cauliflower in a large bowl. Add the olive oil, Italian seasoning, garlic powder, salt, and several grinds of pepper and toss to coat.

Add some of the vegetables to the air fryer basket, just enough to fit in a single layer. Transfer to the air fryer and cook for 10 to 15 minutes (I do 12), tossing halfway, or until the vegetables are tender and browned. Repeat with the remaining veggies.

Transfer the air fried vegetables to a serving dish and squeeze with lemon juice. Top with grated Parmesan cheese, if desired, and garnish with fresh parsley.