Spray the slow cooker with non-stick spray, set aside. In a extra large bowl, stir together the sour cream, 2 cups of the cheese, salt, pepper, garlic powder and onion powder. Add in the frozen hash brown and stir until there is sour cream mixture coating all the hash browns.
Add the cheesy hash brown mixture to the sprayed slow cooker.
Cover and cook on HIGH for 3 hours and 20 minutes. Add the remaining cheese (2 cups) and put the lid back on until the cheese melts.
Serve and enjoy!
Video
Notes
Place any remaining hash brown casserole in an airtight container and keep in the fridge for up to 4 days. Reheat in the microwave or oven until warmed throughout.
Are you tempted to use Greek yogurt instead of sour cream? Don't, for greek yogurt tends to turn watery when added to hot dishes.