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Preheat your oven to 375°F
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Line two baking trays with parchment paper and set aside.
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Sift together flour, cocoa powder, baking powder, baking soda and salt into a large bowl and set aside.
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In the bowl of an electric mixer fitted with the paddle attachment, beat butter for 2 minutes.
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Add sugar and beat on medium speed until light and fluffy.
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Add 2 eggs, one at a time and beat until incorporated.
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Add flour mixture gradually and mix until combined.
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Add the chopped hazelnuts and chocolate and mix with a wooden spoon.
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Flour your hands (the dough is quite sticky) and turn out dough onto a lightly floured surface.
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Cut in half and shape each piece into a 12 inch log.
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Place them onto the baking trays and flatten them slightly.
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Lightly beat the egg white and brush the logs.
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Sprinkle generously with sugar.
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Bake the logs, rotating trays half way through for 25 minutes.
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Transfer the logs onto a cutting board and let cool for 20-30 minutes.
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Reduce the oven temperature to 300°F Cut the logs crosswise to half an inch thick slices.
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Place on a wire rack and bake for 30 minutes.