Set 2 packets of Oreo biscuits aside for garnish. Break 40 Oreos into 4 pc each and grind in a mixie to get a coarse powder. Remove in a bowl. Now separate biscuits crumb in another bowl. To this add the melted butter and mix well.

Put about 2 tsp of butter Oreo mix in individual mousse glasses and press down with the back of a spoon.

Mix instant coffee in hot water. Let it cool down. Add this to the whipping cream and whip it with an electric beater till you get firm peaks.

Now add the Oreo crumbs and combine them well with the help of a spatula. Fill some mousse in piping bags and carefully pipe them in the mousse glasses.

Melt dark chocolate with milk in a bowl and mix well till smooth and shiny. Let it cool a bit then pour 1 tbsp of it over each mousse cups. Chill in the refrigerator.