Boil the potatoes in their skins until tender. Let them cool slightly, then peel and mash them using a potato ricer or masher until completely smooth.
In a large bowl, combine the mashed potatoes with the flour, egg yolk, and salt. Gently mix until a soft, non-sticky dough forms. Be careful not to overwork the dough, as this will result in tough gnocchi.
Divide the dough into four equal portions. On a lightly floured surface, roll each portion into a long rope about 2 cm in diameter. Cut the ropes into 2 cm pieces.
Optional: Roll each gnocchi piece over the tines of a fork to create ridges, which will help the sauce cling to the gnocchi.
Bring a large pot of salted water to a boil. Drop the gnocchi into the boiling water and cook until they float to the surface (about 2-3 minutes). Drain well.
In a large skillet, melt the butter over medium-low heat. Add the heavy cream and simmer gently until the sauce slightly thickens.
Stir in the grated Parmesan cheese and truffle oil. Season with freshly ground black pepper to taste.
Add the cooked gnocchi to the skillet and gently toss to coat them evenly in the truffle cream sauce.
Serve immediately, garnished with fresh chopped parsley and freshly grated truffle.
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