Set up a crumbing station with the seasoned flour, egg mixed with milk, and the seeded crumb mixture.
Coat each chicken fillet lightly in flour, shaking off any excess. Dip into the egg mixture, then press firmly into the seeded crumb, turning to coat both sides well.
Place crumbed schnitzels onto a lined tray. Cover and refrigerate for at least 30 minutes (or up to 2 hours) to help the crumb adhere.