I've tried a lot of recipes that use nutritional yeast, and haven't been impressed.
I do like nutritional yeast, but not as a main ingredient, kwim?
This recipe is our favorite so far:
Mac 'n' Cheese.
We sub in Tinkayada rice pasta and use crumbled GF bread. (If there's anything GF bread is good for, it is making breadcrumbs!

)
This recipe makes a creamy, fairly mild sauce that really does resemble a creamy cheese sauce in look, texture, and taste. It reminded me of something I might find at a supermarket hot bar: not gourmet by any stretch, but acceptable.
The sauce tasted somewhat like Hollandaise before I put the crumbs on top and baked it. After baking, the taste was milder and more like cheese sauce. If I was going to make it "box style" (mix it with the noodles and serve without a baked crumb topping), I'd probably leave the lemon juice and Dijon out, or maybe add a tiny bit to taste just before mixing with noodles. I'd also probably use a little less sauce if not baking it.
If you want to try it, I'd recommend saving the PDF to your desktop, because I suspect the magazine will be updating their website and replacing the recipe soon.