The amount of ingredients naturally depends on the size of your casserole dish, therefore the approximate information! Peel and halve the garlic cloves. Rub the garlic cloves into the baking dish. Slice the potatoes thinly and place 2-3 cm high in the baking dish (fish scale shape). Pour in the milk until you can be seen under the top layer of the potatoes. Pour the cream on top. Salt. Cook at 160 ° for about 40 minutes (a brown crust should have formed on the gratin and the potatoes should be soft (fork test).