In a large microwave-safe bowl, microwave the white chocolate in 30-second increments, stirring until melted and smooth.
Stir the peanut butter into the white chocolate until fully combined.
Mix in the rice cereal and marshmallows.
Using a large cookie scoop or spoon, work quickly to scoop the mixture onto the prepared baking tray. Sprinkle each mound with mini chocolate chips while still soft.
Refrigerate cookies until set.
Notes
We used a 3-tablespoon cookie scoop to make these cookies.