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Using a stand mixer, combine butter with sugar on medium until fluffy
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Add egg and vanilla extract
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Hand-mix in flour, cocoa powder and salt
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Form the dough into a disc, cover with saran wrap, and refrigerate for 30-60 minutes
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Preheat oven to 350 F
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Roll out dough and cut into circles with a cookie cutter (if the dough seems too sticky, add flour until it can easily be rolled out)
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Bake cookies at 350 for 10-12 minutes
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Cool