Preheat waffle maker and spray with cooking spray.
In a large mixing bowl, whisk the eggs and milk.
Cook potatoes in the microwave about 5 minutes until they are soft. Shred into the bowl with the eggs and milk. Stir in cheese, green onions, salt and pepper.
Scoop 1/4 to 1/2 cup of mixture onto waffle iron. Cook for about 5 minutes, checking every few minutes to avoid burning.
When the waffles are golden in color, use a fork or tongs to remove them from the waffle maker.
Serve with catsup, salsa, or sour cream.