One can replace the Butterschmalz with sunflower oil. Some carefully shake the Semmelbrösel over the schnitzel. The Soufflieren creates a wavey Panier. The softer the Semmelbrösel are, the more air can build up. Here is an article one what could be the best Original Wiener Schnitzel - with very narrow-minded perfectionism. https://schlaraffenwelt.de/perfektes-wiener-schnitzel-rezept/