Slice the chicken breasts in half lengthwise to make 4 cutlets. Pound to make ¼ inch thick.
In a shallow bowl, season with salt, garlic powder, Italian seasoning and marinade with Italian dressing at least 1 hour (the longer the better).
Combine breadcrumbs and parmesan cheese in a shallow bowl. Place egg in another shallow bowl. Dip the chicken into the egg, then the breadcrumb mixture. Place on a work surface and spray both sides with oil.
In a single layer, in batches if needed, transfer the cutlets to the air fryer basket and air fryer 400F 4 minutes until the top is golden, then flip and spray the other side, air fry another 3 to 4 minutes, until golden and cooked through.