A process for producing an aerated confectionery coating comprises supplying a liquid confectionery material to a coating head, maintaining the material under substantial super-atmospheric pressure up to the vicinity of the coating head, and forming, by gas injection, gaseous bubbles in the pressurized confectionery material prior to the confectionery material reaching the coating head, the rate of injection of gas into the confectionery material being controlled in response to a measure of the density of confectionery material in the supply to the coating head, excess liquid confectionery material available after coating by the coating head being recirculated into said supply.