Using 3 shallow bowls, place the oat fiber in one, the egg wash in other. The parmesan and seasoning go in the final bowl and are mixed.
Preheat the air fryer to 190C/380F degrees (this usually takes 3 minutes).
Dip the eggplant slices into the oat fiber, then the beaten egg and finally the seasoned parmesan. Continue until all slices are coated.
Place about 4 slices in the air fryer basket (will depend upon the size of the air fryer and eggplant slices) and give them a light spray with oil.
Cook at 190C for 5 minutes until golden and crispy.
Repeat until all eggplant slices are cooked.
Spoon a third of the Marinara sauce over a baking dish. I used an 8 inch circular dish but any size can be used.
Place a layer of the eggplant slices on the Marinara sauce.
Sprinkle a third of the Mozzarella over the eggplant.
Repeat the layers and end with a topping of Mozzarella
Bake in the oven at 190C/375F degrees for 20-25 minutes until the mozzarella is golden and bubbling.
Allow to cool for 5 minutes before serving.