In a pan, sauté the potatoes and onion.
Add the corned beef and season with salt & pepper.
On a bread, place a dollop of the prepared hash and eggs.
Grate a good amount of melting cheese (optional) into the bread and place another slice of bread on top of it.
Using the Breville The Original ‘74™ jaffle maker, toast the sandwich by closing the lid and letting it cook.
Serve and enjoy.