Prep your work space by laying down a silicone baking mat or wax paper to place your dice cookies on after dipping in chocolate.
Melt white chocolate wafers according to package directions. Make sure chocolate is fully melted (thinner consistency makes dipping easier).
Dip each Lorna Doone shortbread square into white chocolate and decorate with mini chocolate chips to look like dice.
For best dipping results, lay cookie on fork tines and dip into melted white chocolate so that it is fully covered. Remove excessive chocolate by gently but vigorously jiggling the fork side to side, so that melted chocolate drips off into bowl.
Slide chocolate-dipped cookie onto silicone baking mat or wax paper and immediately top with mini chocolate chips in dice patterns before white chocolate hardens.
Allow dice to cool and harden, at least 10 minutes. You may refrigerate them to speed up the process.
In large bowl with cover, mix popcorn, Chex Mix, and pretzels. Cover and shake to combine.
Add Reese's dipped pretzels. Shake gently to combine.
Add all bags of M&Ms and all white chocolate-covered dice cookies. Shake gently to combine.
Serve in plastic punch cups. Store leftovers in covered airtight container, out of direct sunlight or in refrigerator.
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