01 - Line two baking sheets with parchment paper or silicone mats to prevent sticking.
02 - Combine chocolate chips, butterscotch chips if using, and butter in a large microwave-safe bowl. Microwave in 30-second intervals, stirring thoroughly after each, until completely melted and smooth, approximately 1–2 minutes total.
03 - Let the melted chocolate mixture cool for 2–3 minutes, then gently fold in peanuts and marshmallows until evenly distributed throughout the coating.
04 - Drop rounded tablespoon-sized portions onto the prepared baking sheets, leaving approximately 1 inch of space between each cluster.
05 - Allow clusters to set at room temperature for 2 hours, or refrigerate for 30–40 minutes until firm and completely set.
06 - Keep finished clusters in an airtight container at room temperature for up to 1 week for optimal freshness.