Melt both chocolates together until smooth.

Poor over you Chex Cereal and stir until all cereal is coated.

Place coated cereal in a 2 gallon zip lock bag or split it up into 2, 1 gallon zip lock bags. Pour powder sugar in bag. Zip it up and shake around until powdered sugar coats all cereal. 

Place in bowl and stir in chopped thin mint cookies. You can either break them apart with your hands or chop them but I leave them chunky. 

Sprinkle Andes baking chips over the top.