- 6 tbsp (85 g) unsalted butter - 10 oz (285 g) marshmallows (about one standard bag or ~4 cups mini) - 1/3 cup (30 g) unsweetened cocoa powder - 6 cups (180 g) Rice Krispies cereal - 1 cup (170 g) semisweet chocolate chips (for drizzle, optional) - 1/2 tsp (2.5 ml) vanilla extract (optional)
1. Lightly grease a 13x9-inch (33x23 cm) pan or line it with parchment. 2. In a large saucepan over low heat, melt butter, then add marshmallows and stir until melted and smooth. 3. Whisk the cocoa powder into the melted marshmallows until fully incorporated and uniform in color; remove from heat and stir in vanilla if using. 4. Quickly fold in the Rice Krispies cereal until evenly coated. 5. Press the mixture firmly into the prepared pan and allow to cool slightly. 6. If using chocolate chips, melt chips in a microwave-safe bowl in 15–20 second intervals, stirring until smooth, then drizzle over the cooled bars. Let set before slicing into 12 pieces.
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