For the Vanilla Buttercream:
250g unsalted butter, at room temperature 500g icing sugar (sifted) 2 tbsp milk, at room temperature
Step 1 – For the buttercream icing, beat the butter in a large bowl until soft and pale. About 5 minutes.
Step 2 – Add half of the icing sugar to the butter, and beat until smooth.
Step 3 – Then add the remaining icing sugar with one tablespoon of the milk, adding more milk if necessary, until the mixture is smooth, creamy with no lumps.