Pour the mint chocolate candy melts into a microwave safe dish. Heat in 30 second increments until completely melted.
Pour the melted chocolate over the top of the cereal (see photo). Using a large spoon, stir the chocolate and cereal together to evenly coat the cereal (see photo).
Divide the chocolate cake mix evenly between the 2 resealable bags.
Pour the chocolate coated cereal into the bags. Seal the bags and shake to completely coat the cereal with chocolate cake mix.
Allow the mixture to cool and store in an airtight container.