Place a steaming rack in a large pot and bring a small amount of water to boil beneath it. Add the potatoes and steam until almost tender, being careful not to undercook. Remove potatoes from pot and let cool. Peel potatoes and squeeze out exess water. Using hands, mix potatoes with egg yolks, flour, parmesan, and salt and pepper until forms dough. On a clean, floured work surface, roll out dough into long, snake-like rolls, dusting with flour if needed. Cut dough into 1" wide pieces and set aside until ready to serve.
To serve, bring a large pot of salted water to boil and add the gnocchi. Cook 1 to 1 1/2 minutes, until shapes are just warm. Strain gnocchi, toss with sauce of your choice, and serve.
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