Most of us respond to cream based on its consistency. Its extra viscosity gives the impression of richness. Cream also has a luxurious mouthfeel. By thickening milk (or even skim milk) with the appropriate thickeners, we can emulate cream. Lambda carrageenan is especially appropriate because it gives liquids a dairy-like finish. Whey powder is derived from milk during cheese making. Keep in mind, though, that this mixture doesn’t behave exactly like cream. If you want to thicken it, simply add more of the hydrocolloids, rather than simmering to reduce.