Spray a 5-6 quart slow cooker with non-stick spray.
Add all ingredients except for the parsley to the slow cooker. Stir well to combine.
Set slow cooker to low, cover, and cook for 3-4 hours or until potatoes are tender.
Stir well and sprinkle with parsley before serving.
Video
Notes
You may use any type of cheese you prefer. Cheddar is the usual cheese for hashbrown casserole, but smoked gouda, gruyere, and pepperjack are all nice as well. We prefer diced frozen hashbrowns, but if you'd like to use shredded just keep an eye on the cook time. The smaller potatoes will cook faster.