The invention relates to a foaming ingredient for use in foamers and creamers. The foaming ingredient consists essentially of one or more proteins and optionally one or more plasticizers forming the wall of vacuoles that comprise entrapped gas. The amount of protein is preferably at least 88% by weight and the amount of plasticizer lies between 0 and 10%. Other minor additives may be present. The protein is preferably caseinate and the plasticizer glycerol or mannitol. The ingredient can be comprised in a foamer or creamer used in beverages, such as instant cappuccino and milkshakes.