1
In a large pot over medium heat, melt the butter. Add the mini marshmallows and unsweetened cocoa powder. Stir continuously until the mixture is smooth and melted.
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2
Gradually add the Rice Krispies cereal to the pot, stirring until all the cereal is evenly coated. If using, fold in the additional mini marshmallows.
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3
Using buttered hands or a spatula, press the mixture evenly into the prepared pan
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