Put the roasted soybeans (nuts) in a bowl, spray with Pam or sprinkle with oil, stir so that oil is evenly coated with beans, then simply throw in the taco mix, stir, then after the beans are throughly coated, while stirring, sprinkle on the salt so that it's evenly distributed.
Also, you can add cayenne pepper, black pepper, or cumin for a bit more spice or hotter snack.
* Please see the "How To Make Soynuts" if you don't want to buy the nuts themselves, it's much cheaper to do it yourself, but takes longer.*