It was amazing. You have to make this.
1 clove garlic
2 pounds potato -- very thinly sliced
1 cup mozzarella -- grated
1 cup Hidden Valley Ranch Dip (or your favorite potato chip dip)
Preheat oven to 350
Butter a shallow - 6 cup (1.5 L) gratin dish and rub it with garlic. Layer half the potatoes in the dish. Sprinkle with salt, half the dip and mozzarella cheese. Add another layer, using the rest of the ingredients.
Bake uncovered until the gratin is crisp and golden on top, from 50-60 minutes.