Place the Chex cereal into a large mixing bowl and set aside.
In a smaller, microwave safe bowl, combine the chocolate chips and peanut butter. Heat in the microwave in 20 second increments, stirring between each set until the chocolate is melted. Stir well.
Pour the chocolate mixture over the Chex and very gently, stir until all the cereal is coated in chocolate.
Sprinkle about ½ cup of powdered sugar over the top of the cereal then place the rest into a gallon sized zipper bag. Scoop the cereal into the bag, close and shake well. All the cereal should be coated in sugar. If there's any clumps, gently separate.
Spread the coated cereal onto a baking sheet and allow it to cool and get crispy. Pour the Andes mints, Snow Caps and mini marshmallows over the top. Serve and enjoy.
Notes
The cereal can be left to crisp for about 30 minutes. When finished, place into an airtight container and leave it on the counter for up to 5 days.
If the cereal is too sticky, add some more powdered sugar and shake to combine again.
We used half the chow for the board. This makes a lot of chow.