Stable Cream Cheese Frosting

Cream cheese frosting fails more often than any other British cake frosting - it splits, goes liquid, and refuses to hold a piped edge. The cause is almost always heat and overmixing. Cream cheese is a fragile emulsion of roughly 55-60% water stabilised by milk proteins; warmth or vigorous beating breaks that emulsion and releases free water. The fix is a simple sequence: beat properly softened butter with sifted icing sugar for a full three to five minutes until pale and fluffy, add flavourings, then add cold cream cheese straight from the fridge and beat only until just incorporated. Drain any visible whey off the cream cheese first, keep the bowl chilled between uses, and resist the temptation to keep mixing. A frosting made this way will pipe a clean dam, hold a semi-naked finish for hours, and will not collapse into a warm cake.