In a medium microwave safe bowl, heat white chocolate chips and butter for 1 minute. Remove from microwave, stir, and heat for another 30 seconds. Stir ingredients again until chips have melted and butter is absorbed into the melted white chocolate. Mixture will be a little thick - this is okay.
Add creamy peanut butter and marshmallow fluff to the bowl with white chocolate, then mix thoroughly. Fluffernutter batter will be thick and oily but should stir freely. If needed, heat bowl in the microwave for another 15-30 seconds to loosen up the batter.
In a large bowl, pour in fluffernutter batter and Chex Mix cereal. Using a spatula, gently fold the cereal into the batter, pulling the batter from the bottom and sides up and over top of the cereal. Continue to stir until pieces of cereal begin to break off on their own (be patient, it will happen!)
Pour powdered sugar in the mixing bowl and use a spatula to stir and coat cereal. Use the thin edge of the spatula to separate any large clumps of cereal that are not breaking apart on their own. If desired, add more powdered sugar for a sweeter taste.
Allow fluffernutter puppy chow to cool for 1 hour, then store in an airtight container. Note: There will likely be small fluffernutter crumbles in the bottom of the bowl when finished. You can save these and use them as a candy topping for cakes, cupcakes, popcorn, etc. Store in a sealed container in the fridge for up to two weeks.
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