Boil the potatoes in their skins until tender. Let them cool slightly, then peel and mash them using a potato ricer until completely smooth.
Combine the mashed potatoes with the flour, egg yolks, and salt. Gently knead until you have a soft, non-sticky dough. Be careful not to overwork it, or the gnocchi will be tough.
Divide the dough into four portions. Roll each portion into a long rope about 2 cm in diameter. Cut the ropes into 2 cm pieces.
Shape the cut pieces with a fork to create a ridged surface, which will help the sauce cling to the gnocchi.
Bring a large pot of salted water to a boil. Drop in the gnocchi and cook until they float to the surface (about 2-3 minutes). Drain well.
In a skillet, melt the butter over medium-low heat. Add the heavy cream and warm through.
Crumble in the gorgonzola cheese and stir until completely melted and smooth.
Stir in the grated Parmesan cheese until the sauce is smooth.
Add the cooked gnocchi to the skillet and gently toss to coat them evenly with the creamy gorgonzola sauce.
Serve immediately, garnished with fresh chopped parsley, toasted walnuts, and extra Parmesan cheese.
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