Spray slow cooker with non-stick cooking spray. Place all ingredients, except for 1/2 cup sharp cheddar cheese if you are using it as a topping, in a 4-5 quart slow cooker and mix until completely incorporated. Place lid on top of slow cooker and cook on low for 4-5 hours.
Remove lid and top potatoes with additional 1/2 cup cheddar cheese. Let cook for 10-15 more minutes or until cheese starts to melt.
Notes
We've tried this recipe with fresh potatoes, but preferred the texture and final product of frozen hashbrowns more.