Preheat the air fryer to 375°F (190°C) for 3–5 minutes.
A hot basket jump-starts crisping.
Slice the zucchini into 1/8-inch rounds. Use a mandoline for even slices or a sharp knife for control.
Pat dry the slices with paper towels. Removing moisture is key to getting them crisp.
Season: In a large bowl, toss zucchini with oil, salt, garlic powder, paprika, and pepper.
Add Parmesan and/or panko if using. Coat evenly but lightly.
Arrange in a single layer in the air fryer basket. Avoid overlapping.
Work in batches if needed.
Air fry for 7–10 minutes, shaking the basket or flipping slices halfway. Cook until golden and crisp at the edges.
Taste and adjust: Sprinkle a pinch of salt or lemon zest while hot if desired.
Serve immediately with your favorite dip, or enjoy plain while still warm and crispy.