Step 1Thinly slice potatoes and layer into greased gratin dish or 1 1/2-quart casserole.
Step 2Mix milk, cream, garlic and salt and pepper to taste. Pour over potatoes. Sprinkle cheese evenly on top. Place dish on baking sheet. Bake at 375 degrees until potatoes are fork tender and top is nicely browned, 1 hour 30 minutes. Cover casserole with foil halfway through baking to keep potatoes from getting too brown.