Chocolate buttercream icing

Beat the soften butter using either a hand mixer or free-standing electric mixer until smooth. Gradually add the icing sugar in 3 separate additions and beat fully between each. Add the cocoa and beat again. Mix in the milk to fully combine. On full speed beat the buttercream for at least 5 minutes until fluffy and smooth. Working fast, beat in the melted chocolate and spread and fill a 20cm cake or fill a large piping bag and pipe over cupcakes.