Wash the zucchini thoroughly under cold water to remove any dirt or pesticides.

Using a sharp knife, slice the zucchini into 1/4-inch thick rounds. This thickness ensures they cook evenly and become crispy.

In a mixing bowl, combine the sliced zucchini with olive oil, garlic powder, onion powder, salt, and black pepper. Toss well to ensure all slices are evenly coated. This step is crucial for flavor and helps the zucchini crisp up in the air fryer.

If using, add the grated parmesan cheese and toss again until evenly distributed.

Preheat your air fryer to 400°F (200°C) for about 5 minutes. Preheating helps achieve a crispy texture.

Place the zucchini slices in a single layer in the air fryer basket. Avoid overcrowding to allow hot air to circulate around each piece, ensuring even cooking.

Air fry the zucchini at 400°F (200°C) for 12-15 minutes, shaking the basket halfway through to promote even cooking. The zucchini should be golden brown and crispy when done.

Once cooked, remove the zucchini from the air fryer and let it cool slightly before serving. This helps maintain their crispiness.