Sanitize all work areas, cutting boards, equipment and sinks used in the preparation of this recipe.
In a large bowl add Chex cereal and set aside.
In a medium metal bowl add chocolate chips, peanut butter, and butter and melt over a double boiler (pot of simmering water), stirring the mixture with a rubber spatula until melted and completely smooth.
Add vanilla extract and salt, stirring until fully combined.
Pour the chocolate peanut butter mixture over the Chex cereal and gently mix (avoid breakage) with a spatula until evenly coated.
Working in two batches, pour half the Chex mix into a ziplock bag with 1 cup of powdered sugar, seal the bag and shake until all the cereal is covered with powdered sugar.
Pour the powdered sugar Chex mix onto a baking sheet and place aside. Repeat with the other half of the Chex cereal and powdered sugar in the same bag, making sure to seal the bag and shake until the Chex cereal is completely covered.
Pour the cereal mixture onto the baking sheet and allow to cool completely.
Once you are ready to serve, place the cereal mixture over a sifter to gently shake off the excess powdered sugar, then transfer to a large mixing bowl.
Evenly distribute M&M's, Pretzels, peanuts, and peanut butter chips into the cereal mixture.
Fill each event branded popcorn container with the mixture, doing your best to evenly incorporate all the ingredients into each container.
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