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1
Preheat oven to 350u00b0. Stir together first 4 ingredients in a bowl. Stir in candy bar chunks.
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2
Beat butter at medium speed with an electric mixer until creamy. Gradually add sugar, beating until blended and stopping to scrape down sides as needed. Add eggs, 1 at a time, beating until blended after each addition. Add flour mixture (1 cup at a time) alternately with liqueur (1 Tbsp. at a time). Beat until blended after each addition.
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3
Divide dough in half. Roll each dough half into a 16-inch-long log, and place on a greased baking sheet. Flatten each log to 3/4-inch thickness. (Dough will be soft and sticky.)
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4
Bake at 350u00b0 for 20 to 25 minutes or just until golden. Remove baked logs, keeping oven on.
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5
Cut each log crosswise into 3 equal sections. Transfer each section to a cutting board, and cut into 1/2-inch-thick slices, wiping knife clean after every 2 cuts. Transfer biscotti to baking sheet, cut sides up.
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6
Turn oven off. Let biscotti stand in oven, with door closed, 1 hour.
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7
Note: For testing purposes only, we used Hershey's Skor Bars for milk chocolate-covered buttery toffee candy bars, Hershey's Symphony Bars for milk chocolate candy bars, and Frangelico for hazelnut liqueur.
