Line the bottom of a springform tin with a circle of baking paper. Stick it down with some spray oil or butter.
Melt butter and add crushed biscuits and chocolate chips.
Press into the bottom of a springform tin and chill. It only needs about half hour, or you can stick it in the freezer for 10 minutes. If you like more butt on your dessert, double the quantities.

Beat the crap out of the cream cheese until smooth. Add sugar and beat again. Separate two eggs, add the yolks to this mix and bash again.

Whip up the egg whites in another bowl until soft peaks. (Like a droopy hard-on). In yet another bowl whip up the cream (again, until it's a medium stiffy).

Melt 100g dark chocolate (slowly). Mix your choccy in with the cream cheese/sugar mixture.

Boil the jug and dissolve two heaped teaspoons powdered gelatine in about 1/4 cup water. Stir like buggery. Very important, this. All the gelatine MUST be dissolved otherwise A. you will end up with a sloppy mess or B. you'll get jelly-like lumps in your cake. Add more water if needs be, just make sure the granules are all gone... Add this mixture to the cheese/choccy/sugary gooeyness and mix well.

Now you have beaten all the ingredients to smithereens and your arm is about to drop off from all the whisking, it's time to be gentle! Fold the egg whites into the cheese/choccy/sugary/gelly mixture carefully, try not to knock the air out. Once that is done, fold in the cream. Make sure all ingredients are combined. Dump this on top of your chilled base and stick back in the fridge.

Go for a beer. Or two. (More beer drinking is optional here, but you do have to get the bugger out of the tin yet, hopefully in one piece, so you might want to do this step now and resume beer drinking after.) It's ready when you pick it up and tilt it and it stays in one place.

Decorate top of cake with stuff. I like to grate some chocolate and use choc chips.

Cut into big fat wedges and serve with more whipped cream (you've got half a pottle left, after all) or some berries if you want to be healthy, or some ice-cream. Or all three.

PS because this does use raw eggs, make sure you get really fresh, good quality eggs.