I make it as labeled (except I make a quadruple batch, and I add double the garlic powder) - and then I usually add a few tablespoons of miso paste (in the large batch). Amazing. Seriously been a staple for about a month now. 
There are some good vegan boxed mac and cheese out there for substitute, but this cheese sauce, I use it for everything and it's sooo satisfying.

There are some good vegan boxed mac and cheese out there for substitute, but this cheese sauce, I use it for everything and it's sooo satisfying.