If using the whole cookie then pulverize them to a crumb, add in melted butter and press into your pie plate or tart tin.
If using the Oreo crumbs then simply stir the ingredients together and press in.
For a crunchy crust bake at 350 for 8 minutes, for a softer one leave as is. I do find that the soft one works on in a pie plate but not in a tart pan.
For the Filling
Chop the chocolate into pieces.
Heat the cream in a saucepan until its scalding hot.
Take it off the heat and stir in the chocolate pieces and coffee until smooth.
Transfer to a mixing bowl, cover and leave in the fridge for four hours or longer. It has to be cold to be able to whip up!
Whip until soft peaks form. Taste – depending on the chocolate you use you may want to tweak it by adding vanilla extract, more sugar, etc.
Pile it into the crust and refrigerate until set – overnight is best.
Garnish with chocolate curls, a caramel drizzle, your favourite candies, fudge sauce etc.
Notes
Note: I usually buy 2 100gram bars of chocolate, 1.5 bar goes into the mousse and the remainder gets turned into chocolate curls by my trusty vegetable peeler. I like using a combination of milk (100g) and dark (50g). If you use mostly dark then you will definitely need to sweeten it!