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Preheat the oven to 350°F, and grease a biscotti pan or large baking sheet.
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Stir together the melted butter, sugar, salt, and baking powder.
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Beat in the Fiori and vanilla, then the eggs.
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Blend in the flours, cranberries, and nuts; the dough will be stiff.
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Place into the prepared biscotti pan, leaving a 3/4" margin free on each side of the pan, to allow for expansion. If you're using a baking sheet, form the dough into a flattened log about 10 1/2" by 4".
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Bake the biscotti dough for 30 to 35 minutes, remove from the oven, and cool for 1 hour.
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Slice on the diagonal into 1/2" to 3/4"-thick pieces. Place them back on the baking sheet, standing them on edge if you can; this will ensure they bake evenly.
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Reduce the oven temperature to 325°F and bake for 22 to 26 minutes, until golden.
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Remove from the oven, and allow to cool on the baking sheet; biscotti will become crisp as they cool. Store airtight.
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Store airtight for several weeks.