Boil milk in a heavy bottomed pan and when it starts to bubble take little amount of milk for mixing custard
Crush the milk biscuits roughly by hand
Take custard and cocoa powder in a bowl and add milk to form paste without lumps
Add custard mix to the milk and whisk continuously keep it in medium flame
When mixture comes to boil add sugar and whisk continuously until it becomes thick
Add biscuits and give a quick mix
Remove from heat and let the mixture cool completely
Add crushed Oreo biscuits at top and refrigerate
