Start by washing the zucchinis. Cut off the ends and slice them into thin rounds using a mandoline slicer or a sharp knife, aiming for about ¼ inch thick.
Place the zucchini slices in a mixing bowl and pat them dry with a kitchen towel or paper towels to remove excess moisture.
Drizzle the olive oil over the zucchini slices and toss until they are evenly coated.
Add the garlic powder, onion powder, smoked paprika, salt, and black pepper. Toss again to ensure that all the slices are well-seasoned.
Preheat the air fryer to 375°F (190°C) for about 5 minutes.
Place the seasoned zucchini slices in the air fryer basket in a single layer. You may need to cook in batches depending on the size of your air fryer.
Air fry for 12-15 minutes, checking halfway through and shaking the basket for even cooking. The zucchini chips should be golden brown and crispy.
Once cooked, remove the chips and let them cool for a few minutes. If desired, sprinkle with grated parmesan cheese for extra flavor before serving.
Store any leftover chips in an airtight container to keep them crisp for a day or two.