Step 1: Prep Cereal: Pour the Rice Chex cereal into a very large mixing bowl or a doubled clean brown paper bag. Set this aside.
Step 2: Melt Creamy Base: In a microwave-safe bowl, combine the sweetened condensed milk, melted butter, and white chocolate or cream cheese chips. Microwave the mixture in 30-second increments, stirring well between each, until the chips are fully melted and the mixture is smooth and creamy.
Step 3: Add Pistachio Flavoring: Add the instant pistachio pudding mix to the creamy mixture and stir until the pudding powder is evenly combined. Then, add the vanilla and salt, ensuring the flavors are well incorporated.
Step 4: Coat the Cereal: Carefully pour the pistachio pudding mixture over the Rice Chex cereal in the large bowl. Gently toss the cereal (or shake the bag) until it is evenly coated with the mixture.
Step 5: Add Powdered Sugar: Sprinkle the powdered sugar over the coated cereal and toss again (or shake the bag vigorously) to ensure that every piece of cereal is covered in the sweet powdered goodness.
Step 6: Cool and Store: Allow the treat to cool and set before transferring it to an airtight container. For the best flavor and texture, enjoy your Pistachio Puppy Chow within the first day or two.
