How to make
Boil the potatoes and mash them along with the mozzarella. Add the salt, baking powder and flour and knead a dough.
Roll it out onto the counter - to about 1 finger thick. Cut out circles using round cookie cutters. You need an even number of circles.
Start putting a piece of ham and piece of cheese onto 1/2 the circles, then place the others on top and press the edges well.
Heat the oil and fry until golden, turn them over to fry evenly.