We just had scalloped potatoes for the holiday and it was an excellent recipe from Cook's Illustrated. Very simple -
simmer 1/8" slices of potatoes (think I used about 10?) in a pot with 3c. cream and 1c. milk, several sprigs of thyme and a couple of bay leaves. Add a clove of crushed garlic. When potatoes are getting to firm tender, transfer into baking dish, sprinkle with cheese of your choice and finish in the oven about 20-25 min. Makes awesome leftovers too.