preheat the oven to 180C

combine the butter and sugar, beat them with an electric mixer until soft

shift the flour into the mixture and mix well

drop the vanilla extract into the mixture

put into the fridge for at least 30minutes

divide the pastry into 8, and press into the tart mould

bake them for 15 minutes until golden brown, then cool them

spread some nutella onto the tart

put the marshmallow inside the tart and bake for 1 minute

press the marshmallow with hand lightly and stick a piece of chocolate on top of them