What a great idea. It makes them extra crispy. And it couldn't be easier.
Wash and peel the potatoes. Shred them and squeeze them dry with a towel. (This ensures that your potatoes brown nicely.)
In a mixing bowl, add the potatoes, followed by salt and pepper to taste.
Spread about a teaspoon of butter on the waffle iron. Pile the shredded potatoes into the waffle iron and close the lid.
After a few minutes, you may wish to squeeze down the lid a bit. Check the potatoes after 10 minutes. In my waffle iron on the medium heat setting, the potatoes showed golden-brown highlights after about 15 minutes. But yours will vary, possibly by quite a bit.
Carefully remove the potatoes from the waffle iron.