200g butter, softened
6 cups (900g) icing sugar mixture
1/2 cup (125ml) milk
1 tsp Vanilla extract
Use an electric mixer to beat the butter until very pale. Gradually add the icing sugar while beating. Add the milk and vanilla essence, and beat until well combined.
You can divide the frosting and add food colouring of your choice. Start with a small amount of colouring and build the colour by adding a bit more food colouring until you get the desired colour!