In a large mixing bowl, combine the cake mix, flour, butter, syrup, extracts and eggs; mix well. Stir in the nuts and the chocolate chips. Divide dough in half. On ungreased baking sheets, shape each in to a 12 inch by 2 inch log.
Bake at 350°F for 30–35 minutes or until firm to the touch. Cool about 15 minutes. Transfer to a cutting board and with a serrated knife, carefully slice diagonally into 1/2 inch slices. Place cut side down on ungreased baking sheets. Bake for 10 minutes. Turn over (carefully!) and bake another 5–10 minutes until firm to touch. Cool on racks.
In a small heavy saucepan, over low heat, melt vanilla chips and shortening. Drizzle over biscotti, let stand till hardened. Store in airtight container.
Makes about 3 1/2 dozen.
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