Spray the crockpot or slow cooker with nonstick spray.
In a large bowl, combine the sour cream, cream of chicken soup, and cooled butter. Gently fold in the hash browns and onion. Stir in the cheeses, reserving a few tablespoons for the top.
Transfer the mixture to the slow cooker, season with salt and pepper, and cook on high for 2 to 3 hours or on low for 4 hours, until hot and tender.
Notes
Model-authored article prose is based on the source's verified recipe card; nutrition is not added.