Make the flax egg by mixing the flax meal with the warm water in a wide, shallow bowl. Let it sit for 5 minutes to allow time for it to thicken.
Slice the squash into 1/4 inch rounds and discard the ends. No need to peel it. Pat the slices dry with a kitchen towel.
Combine the remaining dry ingredients except for the fresh parsley in a separate, wide, shallow bowl. At this point, you should have one wet bowl and one dry bowl. Heat the air fryer to 350°F (180°C) and spray the bottom of it with a thin layer of cooking spray.
One at a time, coat the squash in the flax mixture and then transfer them to the dry breading bowl. Gently coat the slices and then place them in a single layer in the air fryer. There should be a small amount of space between each one. Spray the tops of them with a bit more oil.
Cook the squash for 8-10 minutes, or until golden brown. It’s not necessary to flip them halfway through. Prepare the next batch while one is cooking to save time. Garnish the rounds with fresh parsley and enjoy!