In a shallow bowl, whisk the egg.
In another shallow bowl, add the breadcrumbs, and oil and mix until a crumbly mixture forms.
Dip fish fillets into the egg and then coat with the breadcrumbs mixture.
Grease the Air Fryer Basket with cooking spray and then slide inside.
Adjust the temperature of Air Fryer to 350 °F to preheat for 5 minutes.
After preheating, arrange the fish fillets into the greased Air Fryer Basket in a single layer.
Slide the basket into Air Fryer and set the time for 12 minutes.
After cooking time is finished, remove the fish fillets from Air Fryer and serve.