Line two baking sheets with parchment paper and set aside.

In a large microwave-safe bowl, combine white chocolate and peanut butter. Microwave in 30-second intervals, stirring until smooth.

Add Rice Krispies, peanuts, and marshmallows to the melted mixture, stirring gently to coat evenly.

Using a 2-tablespoon scoop or spoon, drop mounds onto prepared baking sheets. Refrigerate for at least 2 hours until firm.

Store in an airtight container at room temperature for up to 2 weeks or freeze for longer storage.