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Preheat oven to 325 degrees F.
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In a medium bowl, sift together flour, baking powder, salt, and cinnamon. Set aside.
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In another medium bowl, cream together butter and sugar until fluffy.
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Add eggs, vanilla extract, and orange zest and blend until just incorporated.
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Add flour mixture to wet ingredients and stir until just incorporated. This should form a soft dough.
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Add pecans and stir or knead in until evenly distributed.
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Form the dough into a log. (Overmixing can cause the dough to be a little sticky. If this is the case, put a little flour on your hands to help out while forming. It works wonders!
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Place log on a parchment lined baking sheet (or you can use a silicone mat such as a Silpat).
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With the palms of your hands, flatten the log to approximately 1 inch height.
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Bake at 325 degrees F for 35-40 minutes, or until firm to the touch.
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Remove from the oven and reduce heat to 250 degrees F.
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Allow to cool completely before slicing.
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When completely cooled, cut slices about 1/2 inch thick at a slight angle using a serrated blade.
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Return slices to sheet pan, standing upright.
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Bake for an additional 45 minutes at 250 degrees F, or until biscotti is well-dried.
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Cookies can be stored for about a week in an air-tight container.