Instructions

1. Preheat the oven to 170c.
2. Put the flour, sugar, baking powder, salt and butter into a bowl and mix with an electric whisk. Beat on a slow speed until you get a sandy consistency. Gradually pour in half the milk and beat until it is just incorporated.
3. Whisk the egg, vanilla extract and remaining milk together in a separate bowl for just a few seconds. Pour it into the flour mixture and continue beating until combined and smooth. Be careful not to overmix it though.
4. Spoon the mixture into paper cases two-thirds full and bake in the oven for 20-25 minutes. Leave the cupcakes to cool slightly and then turn out onto a wire rack to finish cooling.
5. Once cooked, make a small hole in the centre of each cupcake and fill with a dollop of marshmallow fluff.
6. Make the frosting by beating the icing sugar and butter on a medium speed until the mixture is well combined. Turn the mixer down to a slow speed. Add the milk and vanilla extract a little at a time until they are well incorporated into the butter mixture. Then turn the mixer up to a high speed and beat until the frosting is light and fluffy, at least 5 minutes.
7. Pipe or spoon the frosting onto the cupcakes and top with the mini marshmallows. Decorate with edible glitter or sprinkles.