Ingredients (downscale for less cake)
400 grams of cookues 
150 grams fresh butter
250 grams chocolate fondant (ideal nestlé) (melting chocolate)
2 mid sized eggs
1 and a half glass of milk
2 teaspoons of brandy (whisky also works, but it's less sugary)
150 grams of sugar glassé
1 pinch of salt (optional)
http://farm4.static.flickr.com/3489/3289336849_0653e90158.jpg?v=0
Step 1
Melt chocolate with 2 spoons of milk
Use double boiler for this, don't let the chocolate boil
Stir the butter with the sugar until it's foamy cream
add the egg yolk and the chocolate to it (do not dispose of the rest of the egg!)
Let it cool
Step 2
Stir the egg white 'a punto de nieve' (till it's white foam)
http://3.bp.blogspot.com/-y3xzTGiGzH0/UK4XOaUpdaI/AAAAAAAADw8/Z1MH4Jr4Efo/s1600/pinterestx1_72.png
Add it to the cool chocolate cream
Mix well
Step 3
Heat the milk and add the brandy to it
Wash the cookies on it and then put chocolate over one, and another cookie over it, and chocolate
Make the desired structure with the cookies
http://farm4.static.flickr.com/3422/3289338007_bd6d426344.jpg?v=0
http://farm4.static.flickr.com/3302/3290157226_a35daaf762.jpg?v=0
Step 4 
Cover the cookie laterals and last cookie top with more chocolate, you can now add the desired toppings
http://3.bp.blogspot.com/-y3xzTGiGzH0/UK4XOaUpdaI/AAAAAAAADw8/Z1MH4Jr4Efo/s1600/pinterestx1_72.png
Easy way toppings are chocolate shavings, or more white sugar 
http://farm4.static.flickr.com/3452/3289338689_c72ff6caa1.jpg?v=0
Step 5
Let it cool completely (fridge) so the chocolate gets hard
It's best eaten cold or the chocolate will half melt and it will be a mess
If you dont want it cold get it out of the fridge around 1 hour before eating
Step 6
Dun fucking forget the candles m8
Happy birthday