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["Preheat the oven to 325.", "In a large bowl, whisk together flour, sugar, polenta, baking powder and salt.", "In a medium bowl, whisk together eggs, oil and vanilla until well combined and frothy.", "Pour the egg mixture into the flour mixture and stir with a wooden spoon until combined.", "Turn dough out onto a lightly floured surface.", "Divide in half and shape each half into a log 12""x 2"" wide.", "Carefully move logs onto a baking sheet lined with parchment or a silpat.", "Bake 20 to 25 minutes until the tops are almost firm to the touch.", "Remove and let cool on the pan for 15-20 minutes.", "While waiting, reduce the oven temperature to 300.", "Slice each log diagonally into about 1/2"" slices using a serrated knife.", "Stand the biscotti up about 1/2"" apart on the same baking sheet.", "Place back in the oven and bake until lightly colored and dry, another 20 to 25 minutes.", "Transfer to a wire rack to cool completely."]