Mix eggs, milk and Seasoning Mix in large bowl until well blended. Stir in cheese. Spray inside of 6-quart slow cooker with no stick cooking spray. Spread hash browns evenly on bottom.
Pour egg mixture into slow cooker. Sprinkle with additional cheese, if desired. Cover.
Cook 2 1/2 hours on HIGH or 4 to 4 1/2 hours on LOW or until eggs are set.
Great with salsa, avocado and sour cream.