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In a large bowl, beat butter with electric mixer until light and fluffy.
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Add 1/2 cup powdered sugar and vanilla and beat until well combined
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Add flour and pecans, and mix until dough is well blended.
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Divide dough in half and roll each half into a ball. Wrap in saran wrap and refrigerate for 15-30 minutes until chilled.
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Meanwhile, preheat the oven to 350 and stir together remaining 1 1/2 cups sugar and cinnamon, if using.
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To form cookies, remove small chunks of dough, about 2 tsp each. Roll these into small balls. Bake on baking sheet about 1/2 inch apart until just pale and golden, about 14-18 minutes.
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Cook cookies until they are cool enough to handle, then gently roll them through powdered sugar and cinnamon mixture.