Preheat the oven to 375.

In a saucepan, heat up the cream with a sprig of thyme, chopped garlic and nutmeg.

While cream is heating up, butter a casserole dish. Place a layer of potato in an overlapping pattern and season with salt and pepper. Remove cream from heat, then pour a little over the potatoes. Top with some grated parmesan. Make 2 more layers. Bake uncovered for 45 minutes. Sprinkle some more parmesan and broil until cheese browns, about 5 minutes.