You will need:
115g Icing Sugar
50g Unsalted butter
1 tbsp liquid
Method:
Make sure the butter is at room temperature.
In a bowl, add the butter to icing sugar and push the butter into the icing sugar using a fork. This should help keep the icing dust down.
Once the butter and icing sugar are as mixed as they can be, add the liquid you are using a bit at a time until it is a smooth buttercream. If you add too much liquid, add more icing sugar to bring it back.
Thank you for the recipe, it really helped