In a large bowl, combine the puffed grain cereal, oat cereal rings, and 2 cups (170 G) of fish-shaped crackers.
In a medium, microwave-safe bowl, combine the peanut butter and chocolate chips . Microwave in 30-seconds intervals, stirring between, until the mixture is fully melted and combined, about 2 minutes total.
Pour the melted chocolate mixture over the cereal mixture. Stir until fully combined. Refrigerate for 30 minutes.
Sift in the powdered sugar, ½ cup (55 G) at a time, stirring between additions. Fold in the remaining ½ cup (40 G) of fish-shaped crackers.
The meow mix will keep in an airtight container at room temperature for up to 3 weeks.
