In microwave, melt chocolate wafers with mint candy together for one minute, stir, and continue melting in 30 second intervals until smooth.

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

In a large, gallon-sized ziploc bag, add powdered sugar. Spoon in chocolate cereal mixture, seal, and shake until coated. Pour onto a large piece of wax paper and let set for about 20 minutes. Add peppermint candies with chex and store in an airtight container.