In a large pot with a lid, sauté the mushrooms in a little of the veggie broth (adding a little at a time as needed) until mushrooms are about half done. Add garlic, stir, then add the spinach on top. Cover with the lid (it may be tight at first, depending on the size of your pot). Allow the spinach to steam a few minutes, stirring periodically.
Nutritional yeast is easily available in the loose bins of health food stores. It is high in B-12, has a cheesy flavor and is great on pasta, in sauces, or wherever you would use parmesan cheese or want a cheesy type flavor without the high fat and congestive properties of dairy. We keep a shaker of it handy, the way others keep a shaker of parmesan.
Dixie Diner Club products are available by mail. Call 1-800-233-3668 for a catalog. They are amazingly good, very low fat or no fat, flesh-free, mostly dairy-free, and many are wheat-free. Because of this, their products are incredibly healthy as well! (No cholesterol, low or no fat.) http://www.dixiediner.com/