Creamy vegan mushroom soup

This was the best recipe to come out of last night. It's so good I would make it even if I wasn't serving vegetarians with cream and gluten allergies. I would make it just to eat it myself. I wish I'd taken a picture...

Ingredients:

1 head cauliflower
2 box containers of veggie broth (I prefer Nature's Own)
1 small sweet onion
minced garlic
1 package mushroom mix (baby bellas, crimini, oyster, shiitakes)
1 cup frozen peas
olive oil
salt
black pepper

Special equipment:
Immersion blender (a regular blender would work fine too, it just takes longer and makes more of a mess).

Finely dice the onion. In a soup pot, add 1/2 of the diced onion, two teaspoons of minced garlic, and a tablespoon of olive oil.
Sautee until the onion gets brown, then add one of the containers of veggie broth.
While you bring the broth to a boil, pull the cauliflower into golf-ball sized chunks. Add the cauliflower to the broth and let boil until the cauliflower is very soft (15 minutes?).
Add salt and pepper liberally. Once the cauliflower is soft, use a wooden spoon or potato masher to break the cauliflower into small pieces.
Take the soup off the heat and let cool for a couple minutes, just so you don't burn yourself when the blending makes a mess (I make a mess EVERY time).
Add some of the second box of veggie broth a little at a time to make blending easier. Add no more than half the box though. Blend the soup until very fine and creamy looking. **It's worth noting at this point that what you have now would make a really excellent vegan gravy. It can be boiled down easily enough if you want it thicker
Once blended put the soup back on low heat, add more pepper and the second half of the diced onion and bring to a simmer.
While the soup simmers, coarsely chop your mixed mushrooms until they're about bite sized pieces. Add them and the frozen peas to the soup.
Let boil on low until all the vegetables are soft.

I didn't add parsley this time around, but I think it would make a really good addition. This soup would be phenomenal in a bread bowl, if you have the time and energy.