Spray a 5 or 6-quart slow cooker with no stick cooking spray or use a slow cooker liner and spray it.
Layer frozen potatoes, bacon or sausage, onions, green pepper, salt and pepper, and 1 cup shredded cheese in the crock pot in two or three layers.
Sprinkle the remaining 1 cup shredded cheese over the top evenly.
Beat the eggs, milk, and dry mustard together.
Pour the egg mixture over the cheese layer evenly in the crockpot.
Cook on low for 7 to 8 hours or until eggs are set and thoroughly cooked, start this at midnight and wake up to a delicious breakfast!