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Preheat oven to 375°F. Grease cookie sheets. (or line with parchment paper)
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Beat butter and sugars in large bowl until light and fluffy. Add egg; beat until creamy.
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Drain mandarin oranges, reserving liquid for Orange Frosting. Stir oranges into sugar mixture. Stir together flour, soda, and salt in small bowl; gradually add to sugar mixture until blended. Stir in raisins and walnuts.
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Drop by teaspoons onto prepared cookie sheets. Bake 8-10 minutes; cool. Frost with Orange Frosting.
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Orange Frosting: In a small bowl, combine 2 cups Domino® Confectioners Sugar, 2 tablespoons grated orange rind and 1 tablespoon reserved mandarin orange liquid. If desired, add more liquid until frosting is spreading consistency.