In microwave, melt chocolate wafers with mint candy together for 1 minute, stir and continue melting in 30 second intervals until smooth (~2 minutes).

In a large mixing bowl, combine cereal with melted chocolate. Fold with a large spoon until coated.

Place powdered sugar in a large zippered plastic bag. Add the chocolate-coated cereal, seal, and shake until evenly coated with sugar. Spread on wax paper and let set for 20 minutes. Mix in the mint M&Ms and store in an airtight container.