I did this in 2 batches, as it's a pot full until greens wilt.
Place 1/2 cup broth in large stock pot, 1/2 the mushrooms, spinach, kale, onion and spices...Over medium heat, simmer until greens are wilted and onions and mushrooms are tender. Taste and season more if needed.
Repeat or if you have a very large pot, you could make it all at once. It will shrink down to not near as much as you think it will be. I got about 12 - 1 cup servings. Can be stored in refrigerator and heated as needed.