What is soya powder?!
What is soya powder?
Answers:
could be several things:
Soy milk powder
defatted soy flour
or some sort of soy protien powder.
I believe that it is a soy-based ingredient used in cooking, somewhat like powdered milk.
I would beware of using Soya, as I have heard rumor that it can lead to cancer. But I have not entirely verified that.