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Cream butter and sugar.
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Add egg vanilla and flour.
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Remove dough from mixer and divide in half.
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Add cocoa to one half.
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At this point, you can divide the white dough in half and color red, green or whatever with a few drops of food coloring.
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Roll dough between two sheets of plastic wrap into 7 inch squares, around 3/8" thick.
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Slice into 9 3/4 inch wide strips.
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Alternate colors, stacking 3 layers into checkerboard design. Wrap log in plastic. Make second log with reverse color pattern.
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Chill logs 30 minutes in refrigerator or 15 minutes in freezer.
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Preheat oven to 350°.
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Slice logs into 1/4" cookies and bake for 10-12 minutes.
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Cool two minutes on tray before removing to cooling rack.