Creating the perfect Dauphinoise Potatoes is straightforward if you follow these steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Prepare the Baking Dish: Grease a 9×13-inch baking dish with butter or cooking spray.
3. Slice the Potatoes: Peel the potatoes and slice them thinly (about 1/8 inch thick). A mandoline slicer works great for even slices.
4. Mix the Cream Mixture: In a mixing bowl, combine the heavy cream, milk, minced garlic, salt, black pepper, and nutmeg (if using). Whisk until well blended.
5. Layer the Potatoes: Place a layer of sliced potatoes in the bottom of the prepared baking dish. Pour a portion of the cream mixture over the potatoes, followed by a sprinkle of grated cheese.
6. Repeat Layers: Continue layering potatoes, cream, and cheese until all ingredients are used, finishing with a layer of cream and cheese on top.
7. Cover with Foil: Cover the baking dish with aluminum foil to prevent excessive browning.
8. Bake: Place in the preheated oven and bake for 45 minutes.
9. Uncover and Brown: Remove the foil and bake for an additional 15-20 minutes or until the top is golden brown and the potatoes are tender when pierced with a fork.
10. Let it Rest: Once done, remove from the oven and let it cool for about 10 minutes before serving.

These steps will guide you in creating a creamy, dreamy casserole that will impress anyone lucky enough to share it with you.