Crush the Oreo cookies, to form fine crumbs. Add butter to it and mix well. Press the mixture into the bottom of a small tin and put it in the freezer (just need to freeze for a few minutes only).

Chop both the chocolates and place in a mixing bowl.

Heat the cream over a medium-low heat, don't boil or simmer.

Remove the cream from the heat and pour it over the chocolate and let it sit for a couple of minutes.

Then stir until all the chocolate melts.

Remove the prepared crust from the freezer.

Pour the melted chocolate over the crust.

Refrigerate for a minimum of 2 hours before serving. I normally leave it overnight and serve it the next day.