Place the softened butter into your Thermomix bowl and mix for 30 seconds, speed 2.
Scrape down the sides of the bowl and mix for a further 20 seconds on speed 3 or until pale and creamy,.
Add the icing sugar and vanilla extract and mix for 15 seconds, speed 3.
Scrape down the sides of the bowl and mix for a further 20 seconds, speed 3 or until the buttercream is smooth and creamy.
Transfer your buttercream into a piping bag with a star tip and pipe the top of the cooled cupcakes.
Cut a marshmallow in half for the Easter Bunny ‘ears’ and place on top of the each cupcake add then add the pink smartie ‘nose’. Continue until all of the cupcakes have been decorated. You can then store these cupcakes in an airtight container until needed.