Line a baking sheet with parchment paper. Spread out the cereal onto the pan. Sprinkle 1 cup of the chocolate chips over the cereal. Next, add the 1 cup of mini marshmallows.

Microwave the remaining chips in a microwave‑safe bowl for 1 minute at 70% power, stir, then continue heating in short intervals at 70% power, stirring between each, until smooth. Avoid overheating.

Drizzle melted chocolate over the mixture on the baking sheet, covering as much as you can.

Optional: while the chocolate is still warm, top with 1 more cup of the marshmallows.

Refrigerate about 15 minutes or until it's set. Break into pieces and store in an airtight container.