In a large bowl, mix butter and sugar on high for 2-3 minutes, until light and fluffy. Add egg, yolks, vanilla, and salt; beat well to combine.
On low, gradually beat in flour. Divide dough into 6 equal pieces. Roll each piece into a 6 inch log, wrap in saran wrap, and chill 15-20 minutes in the refrigerator.
Roll one dough log at a time into one color of sugar crystals. Then wrap again in saran wrap. Continue until each log is rolled in a different color and wrapped. Refrigerate completed rolls for 3-8 hours.
Preheat oven to 350 degrees F.
Cut logs into 1/4 inch thick slices and place on a greased baking sheet, 1/2 an inch apart. Bake 12-14 minutes, or until golden. Let cool 2-3 minutes on baking sheet then transfer to wire rack to cool completely. Repeat with remaining dough.
This Rainbow Rounders Cookies recipe is from the 2011 HomeCook'n Collection Cookbook. Download this Cookbook today.
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