Place the dark chocolate in a microwave safe bowl and heat at 20 seconds increments, mixing each time you check it. Continue until it is completely melted.
Set aside to cool while you prepare your other ingredients.
Beat cream cheese and sugar together until smooth.
Mix cocoa powder with hot water until there are no lumps. Set aside to cool.
Once the cream cheese mixture is smooth, add in your melted chocolate and briskly mix until combined.
Add in your cocoa and mix well.
Whip your cream until soft peaks.
Fold half your cream into the cream cheese mixture, once combined fold in the remaining half.
Spoon your mixture into your prepared base and set aside in the fridge for a minimum 2 hours.
This can be made a day ahead.
Serve as is, with more cream or toppings of your choosing.