Boil the potatoes, peel and mash them with a fork. Mix them with the crumbled feta cheese, grated cheese, a little salt, black pepper and finely chopped fresh parsley.
Add the egg and knead it into a mixture. Form meatballs from it.
In a bowl, mix the breadcrumbs and flour, roll each meatball in the mixture and fry in heated oil on both sides.
Take them out onto a napkin to absorb the excess oil and serve with pickles.