01 - Line two baking sheets with parchment paper or silicone baking 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 after each interval, until completely melted and smooth, approximately 1–2 minutes total.
03 - Let the melted chocolate mixture cool for 2–3 minutes to prevent marshmallows from melting. Fold in peanuts and mini marshmallows until evenly distributed throughout the chocolate.
04 - Using a tablespoon or small cookie scoop, drop rounded mounds onto 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 completely firm and holding shape.
06 - Transfer clusters to an airtight container and store at room temperature for up to 1 week.