For Breading
In a large saucepan, add the eggs and add enough water to cover them all.
Turn on the heat to medium and let them cook for 15 minutes.
After this time has passed, drain all the water and let them cool until they reach room temperature.
Next, peel the eggs and transfer them to a plastic bag.
Now, using a potato masher, mash the eggs thoroughly until they are completely crushed.
Add the mayonnaise, some chopped parsley to taste, season with the salt, a pinch of black pepper, seal the bag and mix well to combine everything.
Next, cut off the tip of the bag and set it aside.
Then, crush the slices of crustless bread, place a slice of cheddar cheese on one of the bread slices, also add some of the egg mixture we prepared and cover it with another slice of cheddar cheese.
Brush beaten egg around the filling, add another slice of bread and seal it by pressing the edges with a fork.
After doing that, bread the sandwich by first dipping it in beaten eggs then coat it in panko breadcrumbs.
In a large skillet over medium to low heat, add the vegetable oil and let it heat up.
Add the sandwich we prepared and fry it until golden brown.
Serve.