Question: How do you make marshmallow fluff?

Marcus Gallagher-Jones answered on 16 Mar 2012:

I’m really not sure but the process involves whipping a lot of air into a mixture of sugar, corn syrup, and gelatin or egg whites. The egg whites or gelatin will foam as air is introduced giving that light fluffy texture. By having a certain density of gelatine and sugars (you add these molten to the egg whites) the mixture will hold it’s shape once cooled. The proteins in egg whites are hydrophilic and so hold onto water very tightly. This prevents the sugars from crystallising as the mixture cools. In the case of marshmallow fluff I think you just use less gelatin making the final product less solid.