In a large pot, stir together the ½ cup salted butter, ½ cup unsweetened cocoa powder, and ½ teaspoon espresso powder. Whisk in the 14 oz. sweetened condensed milk until combined.
When mixed well, stir in the 20 soft caramels until completely melted and smooth. Add in the 5 ½ cups mini marshmallows and mix unit melted and smooth.
Remove from the heat and quickly stir in the 1 teaspoon vanilla extract. Fold in the 5 cups puffed rice cereal and fold until the cereal is evenly coated with the mixture.
Line 2 baking pans with parchment paper and use a large cookie scoop to scoop out the cookies onto the parchment and gently press down into a flatter shape.
Place in the refrigerator and allow to set for 30 minutes to 1 hour.
Serve immediately or place in an airtight container for up to three days.
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