Cook the Potatoes: Boil peeled potato chunks in salted water for 15-20 minutes until fork-tender. Drain and mash until smooth.

Make Mashed Potato Balls: Combine mashed potatoes with sugar and cornstarch. Form balls, place mozzarella in the center, and shape into pancakes.

Pan-fry the Pancakes: Fry each pancake in preheated oil for about 6 minutes total, flipping once until golden brown.

Drain and Serve: Transfer to a paper towel-lined plate to absorb excess oil and cool before serving.