Get out a big saucepan and put in the water, bullion cubes, and a short swoosh of vinegar and olive oil (tilt the bottle and pour quickly along one half of the pan and then stop. Rachel Ray style.) Bring to a boil.
In another pan, melt butter and sauté orzo, browning slightly. I also added some of the roasted pepper olive oil.
While the orzo's browning, you can add the mushrooms and any other veggies you wish to the fake chicken broth.
When the orzo looks good (you can't really over or undercook it, so use your judgment), stir it into the broth. Cover and reduce heat to simmering. After about 5 minutes, check and if you see the liquid is starting to really boil off, add the fresh spinach and onion. If it's still really watery, you can wait a few minutes for this step, as these veggies don't take long to cook.
Once the broth has been absorbed, add vegan parmesan, nutritional yeast, salt, and pepper to taste. Garlic salt gives this a really yummy flavor, too!
I just made this tonight and it's so wonderful I plan to make it again at least once this week! I bet it would be delicious cold, too. Enjoy!