"Powdered mix" refers to a substance that comes in the form of a fine powder which needs to be mixed with another substance, usually liquid, to create a specific product or drink. Full definition
This is because I personally don't find protein powder mixed with water very palatable — plant based or otherwise. (fuellingthefork.com)
He suggested a simple bowl of oatmeal with protein powder mixed in. (thebigmansworld.com)
This is why the ideal source of protein to eat after your workout is a whey protein powder mixed with some type of liquid thus creating a whey protein shake. (jaylabpro.com)