Using paper towels or a clean kitchen towel, thoroughly squeeze the excess liquid from the defrosted hash browns. Mix the hash browns, ham, onion, bell pepper and 1 cup of the Cheddar together in a slow cooker.
Whisk together the milk, sour cream, salt, garlic powder, pepper and eggs in a medium bowl until blended. Stir in the cream cheese. Add the mixture to the slow cooker and stir to combine with the hash browns.
Cover and cook on low for 5 hours or high for 3 hours, then sprinkle with the remaining 1 cup Cheddar. Cover and continue to cook on high for an additional 1 hour.
Turn off the slow cooker, remove the lid and let the casserole rest for 30 minutes. Sprinkle with the scallions and serve with ketchup and hot sauce, as desired.
This recipe has been updated and may differ from what was originally published or broadcast.