Begin by blitzing the Oreos in a food processor until these are a fine crumb. Then add these to a mixing bowl.
Pour melted butter over the top of the Oreo crumbs and stir to combine.
Press the mixture into the base of your baking tin.
Place in a refrigerator to chill until ready to use. Once the dessert is made, allow to chill well to ensure the Oreo base firms up into a sturdy crust.