Preheat oven to 350. Line a baking sheet with parchment paper. Whisk the flour,cocoa,expresso, baking powder, soda and salt in a bowl...Beat butter and sugar in a large bowl until light and fluffy 3-5 min. Beat in the eggs one at a time, then beat in the vanilla. Reduce the mixer speed to low and add the flour mixture and beat until just incorporated then beat in the hazlenuts.
Divide the dough in half and put on the prepared baking sheet. Lightly dust your hands and the dough with flour, then shape each piece into an 11 by 2 inch log about 5 inches apart. Freeze until firm..about 10 min
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