Crush the Biscoff Lotus biscuits by placing them in a strong plastic bag and then using rolling pin or similar to crush the biscuits into fine crumbs. You can also do this in a food processor for extra fine crumbs.
In a medium sized bowl, mix together the melted butter and crushed Biscoff (Lotus) biscuits.
Divide between 4-5 ramekins, or 2-3 jars or glasses (depending on size) and firm them up at the bottom. You are aiming for a thinner layer of no more than 1 cm.
In another mixing bowl, whip the double cream (heavy whipping cream) with a tiny pinch of fine salt, until it forms stiff peaks.
In a separate medium mixing bowl, mix together the cream cheese, vanilla extract and icing sugar. You can whip the cream as well, but mixing it with a fork is fine.
Add the whipped cream to the cream cheese and mix together gently.
Split the cream cheese filling into two bowls (using the ones you already have).
Add cocoa powder into one half of the cream cheese filling and mix in.
Fold the Biscoff spread into the second bowl with cream cheese filling. You can completely blend it in or leave it unmixed for a marbling effect.
Divide the cream cheese filling between your jars and smooth over on the top.
Add the chocolate cream cheese layer by dividing it between the ramekins or jars and smoothing the tops. It's slightly easier to achieve a sharp layer look if you leave the first layer of cream cheese filling to firm up in the fridge.
Finally decorate with extra crushed Biscoff biscuits.
If you have the time, leave to chill in the fridge for 1-2 hrs.
Keep in the fridge and eat within 1-2 days.