Start with preparing the mousse. Melt chocolate.
Whip heavy cream until consistency of ice cream.
Place gelatin in cold water.
Heat egg yolks until warm; add chocolate, stirring constantly.
Place gelatin in microwave until gelatin is dissolved.
While gelatin is heating, add one third of heavy cream to the egg yolk and white chocolate mixture and mix well.
Add a little of the cream to the heated gelatin and mix well.
Add both the gelatin mixture and the chocolate mixture to the remaining whipped cream and fold until incorporated.
Fold in crumbled cookies, mixing well.
Let mousse set up, around 2-4 hours.
Then prepare the ganache by melting 16 oz. chocolate and 16 oz. of heavy cream over light heat, Over light heat, mixing until combined.
To serve: Place 3 dozen Oreo cookies on a sheet pan.
Pipe mousse onto cookies, and dip into ganache.