Line a 20cm square cake tin with baking paper, make sure you leave some paper hanging over the edges.
Cut the Oreos into large chunks and set aside until needed.
Roughly chop the white chocolate into pieces and place in a saucepan with the condensed milk,
Cook over a medium heat for 10 - 12 minutes
Add the Oreos to the melted mixture and stir through with a metal spoon.
Working quickly, pour the fudge into the prepared pan and place in the fridge for 4 hours (preferably overnight).
Remove fudge from the fridge and cut into small pieces.