Prepare the vegetables: Start by cutting all the vegetables into uniform pieces to ensure even cooking. Zucchini should be sliced, bell pepper cut into strips, carrots into sticks, and cauliflower into florets.
Season the vegetables: In a large mixing bowl, toss the cut vegetables with olive oil, garlic powder, thyme, black pepper, and a pinch of salt until they are evenly coated.
Add Parmesan: Sprinkle the grated Parmesan cheese over the vegetables and toss them again to ensure the cheese is evenly distributed and sticks to the oil-coated vegetables.
Air fry the vegetables: Preheat your air fryer to 400°F (200°C). Place the seasoned vegetables in the air fryer basket in a single layer. Depending on your air fryer’s size, you may need to do this in batches.
Cook: Air fry the vegetables for 15-20 minutes, shaking the basket halfway through cooking to ensure they cook evenly. The vegetables should be golden and crispy when done.
Serve: Once the vegetables are crispy and golden, remove them from the air fryer and serve immediately.