Peel and wash the potatoes. Cut each potato several times close to each other almost to the half. Place them in an ovenproof dish with the slices of sliced pork. For the sauce, briefly bring milk and cream to the boil. Melt cream cheese in it. Add the sauce thickener and bring to the boil again.
Season with salt, pepper and marjoram. Pour over the potatoes. Grate cheese and spread on top. Cook in the preheated oven (electric cooker: 200 °C/ gas: level 3) for 1-1 1/4 hours. Serve sprinkled with parsley