How do you make custard using a commercial powder?

Custard powder is primarily cornflour/cornstarch, with added colourings and flavourings. The cornflour thickens the mixture, the colourings and flavourings make it appear to be custard (but since it contains no eggs, the final product does not fulfill the exact definition of custard). Depending on whether it is a powder designed to be added to milk, or water, powdered milk or powdered cream can also be added.

To make custard powder, just mix all of your chosen ingredients together. (If the colourings/flavourings are wet, they should be added in a way in which they evenly coat the cornflour, e.g in a "panning" machine, or some form of rotating drum. The cornflour mixture can be "dried" subsequently in a low temperature oven, if necessary).