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Preheat oven to 350 degrees
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Butter and flour a large baking sheet.
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In a bowl, whisk together flour, cocoa powder, baking soda and salt.
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In another bowl with an electric mixer beat together the butter and granulated sugar until light and fluffy. Add eggs and beat until mixed well. Stir in flour mixture to form a stiff dough. Stir in walnuts and chocolate chips.
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On the prepared baking sheet with floured hands, form dough into two slightly flattened logs, each 12 inches long and 2 inches wide, and sprinkle with confectioners' sugar. Bake logs for 35 minutes, or until slightly firm to the touch. Cool biscotti on the baking sheet for 5 minutes.
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On a cutting board, cut biscotti diagonally into 3/4 inch slices.
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Arrange biscotti, cut sides down, on baking sheet and bake until crisp, about 10 minutes.
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Cool biscotti on a rack. Keep the biscotti in air-tight containers for 1 week and, frozen, 1 month. Yields 30 biscotti.