Prepare the dredging station buy whisking together the ingredients for the seasoned flour, and vegan buttermilk in separate bowls. Add the panko / cornflakes to another bowl.
Then dredge the filets in the seasoned flour, the vegan buttermilk, and finally the Panko or Cornflakes. Shake off the excess each time you dredge it and make sure you thoroughly coat it. If you want to double dredge for a thicker breading, dredge in the dry, wet, panko, and then the wet and panko again. You may need to adjust and increase the wet mixture if you go this route!
Spray them with a little cooking oil, and air fry at 400 F / 204 C for 10 - 15 minutes, flipping halfway through. If more time is required, air fry in 3 - 4 minute intervals, checking frequently to avoid burning them.
Serve on a bun for a sandwich, or in any dish that you like!