Pre-heat oven and bake triple choc cookies as per on pack instructions. Allow to cool completely on a wire rack while making the mousse.
Whip the thickened cream until stiff peaks form. In a small bowl, reserve 4 tablespoons of this cream in the fridge to pipe on top of the mousse when set.
In a medium size bowl, combine milk, cooled coffee, icing sugar and melted chocolate until well mixed. To this gently fold in the whipped cream.
Into each glass layer the coffee mouse and chunks of cookie, then repeat each layer once more. Refrigerate for at least 2 hours.
To serve, decorate the top with the reserved cream, some fresh raspberries and chocolate shavings.