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In small microwavable bowl, microwave chocolate chips and oil uncovered on High 1 to 2 minutes, stirring every 30 seconds, until mixture can be stirred smooth. Pick up cookie by edges, and carefully dip halfway into chocolate; gently shake off excess. Place on cooking parchment paper or waxed paper. Repeat with remaining cookies. Refrigerate dipped cookies 20 to 30 minutes or until chocolate is set. Store covered in refrigerator.