Wash the schnitzel and dab dry. Wrap 6 schnitzels with one slice of bacon each. Heat oil in a pan. Fry escalopes in portions on each side for about 2 minutes. Remove and keep warm.
Clean and wash the leek and cut it diagonally into rings. Swivel briefly in hot frying fat. Layer the schnitzel and leek in an ovenproof dish. Dice cheese roughly. Mix cheese, cream and stock and season with salt and pepper.
Pour the sauce into the casserole dish. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 15 minutes.