A process comprises concentrating a whey composition to at least about 75 weight % solids in one or more evaporators connected in series to form a concentrated whey composition, wherein at least one of the evaporators comprises an evaporator configured to agitate the whey composition within the at least one evaporator, crystallizing at least a portion of the lactose in the concentrated whey composition in a crystallization cascade comprising one or more crystallizing stages to form an at least partially-crystallized whey composition and drying the at least partially-crystallized whey composition to form a dried whey product.
