I've been hearing about Whoopie Pies for some time now - yet not tried one or made any. This month's (June - in May) Sainsbury's magazine has some stunning photos of whoopie pies and a good variation of ideas for flavours and toppings. I'd link to it - but they don't seem to have a website for readers or post their recipes online.
The magazine is really cheap and it is worth buyin for the Whoopie article alone. However - I must say that I wasn't bowled over by the marshmallow filling, nor was there quite enough. Next time I attempt whoopie pies, I'd make my own mallow filling from scratch. The cake batter part of the recipe however was not bad at all.
Basically, you make the mix and pipe it into rounds on to baking parchment on a tray. I used silicone baking tray liners instead. I can't remember last time I used greaseproof paper or baking parchment - the silicone baking tray liners are just so versatile !
Our baking tray liners / sheets have two sides. One matt finish and one shiny sleek finish. I like to use the matt side for chips / fish fingers etc and the shiny / sleek side for cakes and biscuits