Whip the butter on high until light and fluffy, around 10 mins.
Add your icing sugar in 3 stages and mix on LOW each time until fully incorporated.
On the final amount of icing sugar add in your cream and icing sugar, then back on low for around 3 mins.
Now remove a few tablespoons of the buttercream and heat for 10 seconds in the microwave and then add this back to the remaining mix and whip on LOW again for around 3 mins (Do this this twice, don't do a larger batch, the buttercream will split, add one amount whip and then repeat)
Place into the fridge to "settle" and then whip again on LOW for around 3 mins and then it is all ready….. super smooth, no air, beautiful to pipe with and will smooth on a cake beautifully
