Another recommendation here - the Happy Herbivore's quick queso sauce.
As you can see, I ate it with pasta and broccoli. It's a fantastic replacement for cheese sauce, and has this great oniony-paprika taste. Today, I think I'll try it baked onto pasta, with a tomato sauce (or just tomato purée, because I am lazy and not going to tesco).
I made the recipe exactly as written here, no changes or substitutions. Though I did leave out the cayenne pepper and added in some black pepper instead. And added some flaxseed.