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Preheat the oven to 350 degrees.
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Put the almonds in a large ziplock bag and crush them, using a rolling pin or wooden spoon. (You could alternatively use a few pulses in the food processor. I enjoy unleashing some aggression.) Set aside.
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Line a baking sheet with parchment paper or silicon baking mat.
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In a medium bowl, stir together flour, baking powder and salt.
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Using an electric mixer in a large bowl, beat the butter and sugar together until light and fluffy, about 3-4 minutes.
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Add the eggs, one at a time, until well-incorporated.
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Add the vanilla.
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Gently stir in the flour mixture until just combined.*
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Fold in the almonds and the chocolate chips.
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Divide the dough in half, and shape into two logs 12 inches long, 2½ inches wide and 1 inch high.
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Bake for 35 minutes, and then remove, leaving the oven on.
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After letting it cool for about 5 minutes (they will still be warm), cut each log into ½ inch slices on the diagonal.
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Place the slices back on the baking sheet (use two baking sheets to fit all the pieces), and bake for 7-8 minutes.
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Remove the baking sheets from the oven, and turn each piece of biscotti over.
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Return to the oven and bake for another 7-8 minutes until crisp.
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Let them cool.
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Serve when cooled, or store in an airtight container for up to a week.