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 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, or the gnocchi will become tough.
Divide the dough into four equal portions. Roll each portion into a long rope, about 2 cm (¾ inch) in diameter. Cut the ropes into 2 cm (¾ inch) pieces.
If desired, roll each piece over a fork to create ridges, which will help the sauce cling to the gnocchi.
Bring a large pot of salted water to a boil. Add the gnocchi and cook until they float to the surface (about 2-3 minutes). Drain well.
In a large skillet, melt the butter over medium heat. Add the finely chopped garlic and sauté until fragrant, about 1 minute.
Pour in the heavy cream and let it simmer over low heat, stirring occasionally, until it thickens slightly.
Add the grated smoked cheese and Parmesan cheese, and stir until completely melted and smooth.
Add the cooked gnocchi to the skillet and gently toss to coat them evenly in the creamy smoked cheese sauce.
Serve immediately, garnished with fresh chopped parsley and extra grated smoked cheese.
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