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Beat butter and sugar together in a bowl.
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Add yolk and vanilla and beat mixture until smooth.
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Add flour and salt and mix to form a smooth dough.
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Wrap in plastic wrap and refrigerate for 30 minutes.
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Preheat to 350°F.
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Color 1/2 of the dough with red food coloring.
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Add cheeries to pink dough.
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Wrap and chill for another 10 minutes.
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Roll dough out to 1/4in thickness.
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Place pink dough on top of plain dough.
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Trim edges and roll into a log starting from a long side.
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Slice log into 1/4in slices.
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Arrange on cookie sheet.
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Bake 15 minutes.