In glass pie plate, place cocoa. In medium microwavable bowl, microwave semisweet chocolate uncovered on High 1 to 2 minutes, stirring once, until chocolate can be stirred smooth. Using hands, drop frozen bonbons in melted chocolate and roll with hands to coat completely. Gently drop coated balls in cocoa, shaking pie plate to coat. Return balls to cookie sheets. Refrigerate 1 hour or until coating is firm. Store in refrigerator or freezer.