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In a large bowl, cream together butter and sugar until pale and fluffy, about 2 minutes. Add egg, egg yolk, and vanilla; mix until smooth.
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In a medium bowl, combine flour and salt. Add flour mixture to butter mixture in two additions, mixing until just combined after each addition.
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Split dough in half. Roll half the dough into a 14" x 9" rectangle. Spread half the Nutella over the cookie dough. Sprinkle with half the nuts. Roll the dough up, starting with the long side, to create a cookie log. Repeat with remaining dough.
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Wrap cookie dough log in plastic wrap and refrigerate for at least 1 hour.
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Preheat oven to 350 degrees F. Line a baking sheet with Sil-Pat or parchment paper.
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Remove cookie dough log from fridge. Cut off excess dough at edge, and then slice into 1/4" slices. Place slices on prepared baking sheets.
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Bake for 8 to 10 minutes, or until edges just begin to brown. Remove from oven. Cool on baking sheet for 1 minute, then transfer to wire rack to cool completely.