Thinly slice the potatoes. Place in a saucepan, cover with the milk and season with some salt, pepper and grated nutmeg
Bring to a simmer over medium-low heat and simmer until the potato is almost cooked but still firm. Strain and set the milk aside.
Rub an 8 x 6-1/2-inch oblong baking dish with some butter. Arrange the potatoes in even layers in the dish.
Reheat the milk and allow to simmer for a few minutes. Add the cream and garlic, bring back to a simmer and check the seasoning. Simmer for a few minutes, then pour over the potatoes. Sprinkle with the shredded cheese and bake for 35 - 45 minutes, or until the potatoes are tender and the top is lightly browned.