Chop the marshmallows in small size if they are big. Leave them whole if using mini regular marshmallows.
Combine marshmallows , 3/4 cup cream , chocolate chips and coffee powder in a medium saucepan over low heat and cook until melted and smooth. You need to keep pressing with the back of a spoon for uniform melting. It will take around 8-10 minutes. You might see few grain sized pieces of marshmallows in the end but that should be ok. Switch off the heat and keep stirring and they will melt with residual heat. Let it cool.
In a seperate mixing bowl, add the remaining cream (1.25 cups) and vanilla extract. Whisk the cream and vanilla to stiff peaks with an electric hand mixer on medium speed.
Add half of the whipped cream to the cooled chocolate mix and whisk until fully combined.
Gently fold in the remaining cream until fully combined.
Transfer to dessert glasses or ramekins and refrigerate for at least 1 hour or until set.
Before serving, garnish with additional whipped cream, shaved chocolate or raspberries.
Enjoy!