Peel onions and cut them into rings. Line a greased fat pan with them. Dab schnitzel dry. Season with salt and pepper and place on the onion rings. Spread mince on the escalopes.
Clean, wash and cut the leek into rings. Wash and slice the tomatoes. Drain mushrooms. Wash the herbs. Cut chives into small rolls, chop parsley. Cover meat with leek, tomatoes, mushrooms and half of the herbs.
Cover with cheese.
Bake the schnitzel pizza in a preheated oven (electric cooker: 250 °C/circulating air: 225 °C/gas: see manufacturer) for approx. 45 minutes.
Mix the cream with all the sauce powder and pour over the escalopes approx. 10 minutes before the end of the cooking time and continue to bake. Sprinkle with remaining herbs.