Heat oven to 200C/180C fan/gas 6 (or a BBQ). Make a slit through the skin of the bananas along one side making sure you dont cut all the way through to the other side. Poke in the chocolate buttons along the cut. Put each banana onto a sheet of foil and crimp the edges together to seal into a parcel.
Transfer to a baking sheet and cook for 25 mins until the bananas have turned black (or pop straight into the BBQ embers for 15 mins).
Serve with a scoop of ice cream and any melted chocolate that has escaped!
