For Breading
Start by cutting the peeled potatoes into smaller pieces.
Transfer the potatoes to a large saucepan, add enough water to cover all of them, add the salt, cover the saucepan and let them boil for 15 minutes.
After this indicated time, drain all the water from the potatoes and transfer them to a bowl; mash them well with a potato masher until a smooth mixture forms.
Add the grated mozzarella cheese, the black pepper, mix until combined. Add parsley to taste and mix again.
After that, cut the slices of ham and the slices of mozzarella cheese in half.
Next, get a portion of the potato mixture, flatten it on your hand and place half slice of ham and half slice of mozzarella in the center of the mixture, roll up the slices and shape the potato mixture into a ball, covering the ham and cheese filling.
Repeat this process with the whole potato mixture and filling.
To bread the balls, first coat them in the cornstarch, then dip them in the beaten eggs and finally, coat them in the panko flour.
Repeat this process with all the balls we prepared.
Now, fill a saucepan halfway with oil, and once the oil is hot enough, add the balls and fry them until golden brown.
Remove them from the oil and soak up the excess grease on a plate lined with paper towels.
Serve.