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Preheat oven to 400 degrees
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In a food processor, pulse together the flour, baking powder, and salt.
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Add the cold shortening, and pulse just a couple of times, until the shortening is cut into pea-sized pieces.
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Add in the buttermilk, and pulse until dough forms.
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Remove from the processor, and knead in the chopped walnuts and the dark chocolate.
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Pat the dough until it's about 3/4 inch thick. Use the biscuit cutter, and pat together the scraps to get a few more biscuits.
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Place on a lined baking sheet, and brush the tops with cream.
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Bake for 12-15 minutes, until the tops are golden.