That soup sounds just right for this time of year. I don't have an immersion blender but they make a lot of sense.
We had Mustgo Stew. I used 1 can of an organic black bean soup by Pacific Foods as my base. (Not totally vegetarian, but you could use a strictly bean or pea soup.) Pacific Foods is my current favorite and I stock up whenever they go on sale. They don't seem to have the bisphenol liners, but the soup still tastes good with no metallic taste.
Then I added extra water and threw in all the 'must go' leftovers. Brown rice, a sautee of Chantrelle mushrooms, carrots, yellow crookneck squash and summer pan squash, and onions. (Squash and yummy mushrooms were from the farmer's market.) Also leftover vegetarian baked beans. It all worked together and we had some more freshly steamed squash on the side.
Here's a real recipe I found. You could substitute a mild vegetable broth for the chicken broth. I wish there were a good substitute for milk. I'm allergic to milk and eggs, so that rules out a lot of things. I eat them every now and then, but can't handle them often.
Chantrelle Sweet Potato Cream Souphttp://www.rrich.com/mschntrsoup.html