Add the mashed potatoes to a bowl along with egg, chopped parsley, salt and pepper.
Roll potato mixture into balls and then roll them in the pankp breadcrumbs and then set on a tray while you heat the oil. Make as many as you can with the potato mix.
When the oil is hot, fry the balls for a few minutes, rolling them around so they fry evenly. As soon as the balls come out of the oil place them on a paper towel and hit them with a sprinkle of maldon salt.