Grainy buttercream is a common frustration that usually comes down to the type of confectioners' sugar or insufficient whipping time. Using pure cane sugar instead of beet sugar, and beating the mixture for a full three to four minutes, ensures a perfectly smooth, professional finish without the gritty mouthfeel.

This classic frosting relies on a straightforward ratio of softened room temperature butter to sifted sugar, stabilised by a splash of milk. It provides a sturdy structure for piping intricate borders or simply swirling generously over cupcakes. The technique is simple, but the extended whipping phase is the crucial step that transforms a dense, heavy mixture into a light, airy icing that holds its shape beautifully at room temperature.