preheat oven to 220ºC

cut potatoes in half and bake for 40-60 minutes or until insides are soft.

allow potatoes to cool, peel and mash

mix in egg yolks and parmesan cheese, add a pinch of salt and pepper

place potato dough on a floured surface and gradually add the flour, untilbdough is no longer sticky

divide dough into fist-sized pieces, roll into sausage shapes about 15cm long

flatten dough pieces and lay strips of prosciutto along the middle, then foldbdough over prosciutto and roll

repeat with all the dough and then cut each strip into pieces about 2cm

boil a large pot of water, cook gnocchi, scooping it out when it rises to the top of the water

melt butter over a medium-heat in a large frying pan, add sage leaves and fry until crispy. toss cooked gnocchi through hot butter and serve.