Preheat air fryer to 350°F. Whisk egg in a shallow bowl.

In a separate shallow bowl, combine panko breadcrumbs, parmesan cheese, and salt.

Coat zucchini slices in egg. Transfer to panko bowl and cover entire chip, pressing panko mixture into the chip on both sides using a fork.

Spray air fryer basket with oil sprayer or brush with oil. Place zucchini chips in a single layer, leaving space in between. Spray or brush both sides with oil.

Cook 5 to 6 minutes. Flip and cook another 5 minutes or until golden brown.

While the batch is cooking, repeat step 3 to prepare the rest of the zucchini chips. Repeat step 4 and 5 with remaining zucchini.

Serve with ranch dressing or your favorite dipping sauce.