Whip the cream cheese in a large mixing bowl with a hand mixer until smooth and fluffy.
Add the cocoa mix to the cream cheese, a little at a time, until completely mixed in. Mix in the marshmallow cream until thoroughly combined.
Fold in the Cool Whip with a rubber spatula until there are no streaks.
Transfer the dip into a serving bowl. Cover and chill until ready to serve, or serve immediately with a garnish of mini marshmallows on top alongside your favorite dippers.
Notes
Keep leftovers in the fridge for up to 3 days. Freeze for up to 3 months.