Add the oreo cookies to your food processor and process into crumbs.
Add the melted butter in with the cookie crumbs and process again until well combined.
Transfer to a 9-inch pie dish (sprayed with non-stick spray) and press down firmly with the back of a spoon, working it up the sides a little bit. Place into the fridge to set while you work on the filling.
Break up the chocolate and place it into a bowl.
Heat the heavy cream to a simmer* and then pour the cream over the chocolate making sure the chocolate is completely covered. Let it sit for a minute.
Whisk up the cream and chocolate with a hand whisk until you have a thick chocolate sauce.
Add in the roasted salted mixed nuts and fold them into the chocolate.
Pour out over your oreo pie crust and smooth down.
Refrigerate for several hours or overnight until completely firm and set.
Decorate with some grated chocolate shavings (optional) and serve.