Whisk together the cream, egg, salt, pepper and nutmeg.
Rub the crushed garlic clove all over the inside of a baking dish. Grease with 1 tablespoon of butter. Layer the potatoes inside the dish, then pour over the cream mixture. Top with grated cheese.
Bake in a preheated 180 degrees C oven for 45 minutes, till browned and bubbly.