Grease the baking dish with a little butter. Peel the garlic, cut in half and rub it into the baking dish.
Peel and rinse the potatoes and thinly slice or slice them. Then layer the slices diagonally in the baking dish like a roof tile. Season the whole thing with salt, pepper and nutmeg. Mix the cream with the cream horseradish and pour over the potatoes. Then spread the parmesan over the top.
Then bake the whole thing in a preheated oven at 180 ° C for about 45-50 minutes.