Preheat oven/airfryer to 200 degrees Celsius.
Add your breadcrumbs and parmesan to a bowl and season with salt, pepper, oregano and garlic powder.
Add the egg to another bowl and whisk well with a fork.
Add the flour to another bowl.
Dip each chicken fillet into the flour to coat and shake off any excess.
Next, dip the chicken fillet into the egg and again shake off excess.
Finally, dip the chicken into the breadcrumb mixture, press down and roll to coat each side.
Add to a lined and sprayed baking tray and repeat with all the chicken fillets.
Bake or airfry at 200 degrees Celsius for 15-20 minutes flipping half way through until the chicken is white throughout and the coating is golden brown. (they may need an extra few minutes in an oven).