Vanilla Frosting (Hummingbird Bakery)

Makes enough for 12 cupcakes

Ingredients
250g icing sugar, sifted
80g unsalted butter, at room temperature
25ml milk
a couple of drops of vanilla extract

Instructions
1. Beat the icing sugar and butter together in a free standing mixer on medium slow speed until well mixed. Turn the mixture down to slow speed.
2. Combine the milk and vanilla extract in a separate bowl, then add to the butter mixture a couple of spoonfuls at a time. 
3. Once all incorporated, turn the mixer up to high speed. Continue beating until the frosting is light and fluffy, at least 5 minutes. 

Taken from The Hummingbird Bakery Cookbook