01 -
Add the Chex cereal to a very large mixing bowl. Stir in 3/4 cup of the chopped Butterfinger pieces and reserve the rest for finishing.
02 -
Combine the chocolate chips, peanut butter, and butter in a microwave-safe bowl. Microwave in 20-second bursts, stirring after each, until smooth and glossy.
03 -
Stir the vanilla and kosher salt into the warm chocolate mixture. It should be pourable and smooth.
04 -
Pour the chocolate mixture over the cereal. Fold gently with a flexible spatula until the cereal is evenly coated without crushing the pieces.
05 -
Add the powdered sugar to a large zip-top bag. Add the coated cereal, seal tightly, and shake until all pieces are coated.
06 -
Spread the puppy chow on a parchment-lined baking sheet for 25-30 minutes, until set. Fold in the remaining chopped Butterfinger pieces before serving or storing.