- Lightly grease the slow cooker.
- Layer half of the sliced potatoes in the bottom.
- Spread half of the cream of mushroom soup over the potatoes.
- Sprinkle some cheese on top.
- Repeat the layers with the remaining potatoes, soup, and cheese.
- Pour the milk evenly over everything.
- Cover and cook on LOW for 6–7 hours or HIGH for 3–4 hours, until the potatoes are tender.
- Let sit for a few minutes before serving to allow it to set.
4-Ingredient Slow Cooker Creamy Potato Bake