Named Best Vegetarian Gravy online, I tried this for Thanksgiving, and it was actually really good. I had to leave out the shitake mushrooms, not because I didn't have them, but because the smell of rehydrated dry mushrooms was going to make me sick. The gravy was excellent without them. And I did use the Marmite - thank you, Amazon!
Potato Mushroom Bake......with onion, garlic, cream, onion soup powder, butter cheese and breadcrumbs. This recipe has no meat in it. If you want meat, I'd see no problem with adding ground beef or maybe shredded chicken!