Start by gathering all your ingredients and measuring them out. This will make the process smoother and more enjoyable.
In a microwave-safe bowl, combine the milk chocolate chips and white chocolate chips. Microwave in 30-second intervals, stirring in between, until fully melted and smooth. Be careful not to overheat as chocolate can burn easily.
In a large mixing bowl, add your Chex cereals. Pour the melted chocolate mixture over the cereals. Using a spatula, gently fold the mixture until all the cereal is evenly coated.
Crush the Oreo cookies into small pieces and fold them into the chocolate-coated cereal mixture.
Sprinkle half of the powdered sugar over the chocolate-coated cereal mixture. Gently toss to coat. Then add the remaining powdered sugar and toss again until everything is well coated.
Spread the mixture evenly on a baking sheet lined with parchment paper. Let it cool for about 30 minutes to set.
Once cooled, break apart any large clusters, and serve in bowls or store in an airtight container.
