Separate your Oreo into biscuits and peanut butter cream. Pop each part in two bowls. Bash up your biscuits to fine crumbs then mix with the melted butter Spoon into 13 little ramekins and press down. Whip your cream cheese with your peanut butter cream. You want it nicely aerated and well incorporated. Spoon into your ramekins on top of the biscuit.
Top each ramekin with marshmallows and pop under the grill for 1 minute, or until nicely coloured and a little melted. Watch they don’t burn!
Leave for 30 seconds for the top to ‘set’.