Divide the chex cereal into two bowls.  2 1/2 cups in each.

In a food processor crush 8 thin mint cookies until fine.  You can also crush in a gallon size bag with rolling pin.

In two gallon size bags, add 1/2 cup powdered sugar into each bag with 1/2 of the crushed thin mints into each bag. (It was about 1/2 cup of crushed thin mints.)  Set aside.

Melt the mint chocolate chips (or green candy melts) and milk chocolate in separate microwave safe bowls.   Melt 30 seconds at a time with 1/2 tsp shortening in each stirring after each 30 seconds until melted.

Once melted, stir in the chocolate into the separate bowls with Chex cereal until the Chex are coated well with the chocolate.

Add the mint chocolate and milk chocolate separately to the gallon sized bags with powdered sugar and crushed thin mints and shake until they are coated.