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1
In a large bowl, cream together butter, sugar, orange zest, and vanilla with an electric mixer until light and fluffy. Mix in eggs and egg white one at a time, beating well after each addition. Sift together the flour, baking powder, and salt; gradually blend into the creamed mixture using a wooden spoon. Stir in the white chocolate, dried cranberries, and pistachios. Cover, and chill for 30 minutes, or until dough is no longer sticky.
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2
Preheat oven to 325 degrees F (165 degrees C). Line a baking sheet with parchment paper.
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3
Turn dough out on a lightly floured surface, and divide into halves. Form each half into a flattish log about 12 inches long by 3 inches wide. Arrange logs at least 3 inches apart on baking sheet.
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4
Bake for 30 minutes in preheated oven, or until pale gold. Allow logs to cool on the baking sheet until cool enough to handle. On a cutting board, cut logs crosswise on a diagonal into 1 inch thick slices. Arrange on baking sheet.
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5
Bake for an additional 15 minutes, or until golden. Transfer biscotti to wire racks, and cool completely. Store in an airtight container at room temperature.
