This is the ultimate set-it-and-forget-it comfort food, perfect for a busy weeknight or a holiday brunch. Frozen hash browns are combined with a rich, creamy cheese sauce and slow-cooked to tender, savory perfection. It's a crowd-pleasing dish that asks for very little effort in return.
Do not thaw the hash browns. Cook only on the LOW setting to prevent the dairy from separating. For a vegetarian version, use cream of mushroom soup. To make ahead, assemble the casserole (without final topping) in the slow cooker insert, cover, and refrigerate overnight. Cook the next day, adding 30-60 extra minutes.