Crush the cookies either using a food processor, or a ziplock bag and rolling pin. You want them to be fairly finely crushed!
Combine the melted butter and cookie crumbs, then add to the cheesecake pan wells evenly. Press down (a shot glass, or a small bottle) so it is firmly packed.
Bake crust in the oven for 10 minutes. Remove and let cool while you make the filling.
Reduce the oven temp to 250°F
For the filling
Melt chocolate and set aside
In a mixer, beat the cream cheese until smooth. Add the sugar and continue to beat until well mixed.
Add the egg and vanilla, and beat until well mixed (and not lumpy)
Add the chocolate and kahlua and beat until very well blended.
Fill the cheesecake wells about 3/4 full (can use a ziploc bag with a corner cut off for easy work!)
Bake until the filling just sets - about 25 minutes.
Cool the pan to room temperature, then put the pan in the fridge to chill thoroughly (about 2-3 hours)
Remove from the pan, and garnish with some whipped cream and cookie crumbs (or cocoa powder)