To begin, line a round spring form cake pan with parchment or waxed paper. Set aside for now.
Pulverize the cookies in a food processor. Scoop out 1/3 cup of the crumbs and set them aside.
In a small mixing bowl, combine the rest of the cookie crumbs and the melted butter. Stir them together.
Spread the crumb mixture in the bottom of your prepared pan and press them down. Set this aside for the time being.
In a chilled mixing bowl (and beaters), combine whipping cream, mascarpone cheese, sugar, cocoa, vanilla, coffee granules, and liqueur. Mix it together slowly until incorporated. Then mix on high speed, beating until very fluffy with firm peaks - the consistency of a thick shaving cream.
Spread about half of the mocha mixture over the cookie mixture in the pan. Spoon it in dollops and then gently spread it out smooth using an offset spatula. Sprinkle with the reserved cookie crumbs. Repeat with the other half of the filling.
Sprinkle the top with shaved chocolate.
Cover the pan with foil or plastic wrap, and refrigerate it at least 8 hours, or overnight so that it can set up well.
Enjoy!
Notes
The cookies I like to use to make this can be found HERE. If you can't find crunchy chocolate cookies, you can also use chocolate graham crackers. Just take the cookies or crackers and pulse them in a blender or food processor to make the cookie crumbs.If you can't find instant espresso, you can use instant coffee. The granules are usually larger, so crush them with the back of a spoon until they are a powder.