Cook potatoes, peel and smash mashed. Add the flour and stir well. Make a well and add the egg, melted butter, grated feta cheese, salt, pepper and yeast (previously dissolved in a little water or milk). Involved soft dough, which is left to rise for approximately 2 hours or until doubled in volume. Then spread into a greased tray. Separate bowl whisk the eggs with the milk and add to chopped ham, processed cheese cut into small pieces, salt and pepper. Mix well and put on the dough. Baked and slightly before withdrawing sprinkle with cheese and bake some more.