Melt Chocolate and Peanut Butter: In a microwave-safe bowl, combine chocolate chips and peanut butter. Heat in 30-second intervals until fully melted, stirring until smooth.
Add Cereal: Once melted, gently fold in your chosen cereal until all pieces are coated with the chocolate-peanut butter mixture.
Add Pistachios: Fold in chopped pistachios carefully so they are evenly distributed throughout the mixture.
Coat with Powdered Sugar: Transfer the mixture into a large resealable bag or bowl with powdered sugar. Shake or stir until everything is well-coated.
Cool and Serve: Spread the coated puppy chow on a baking sheet lined with parchment paper to cool completely before serving.
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