First I'll give you the recipe that the Vitamix book provides, and then I'll tell you how I modified it.
Veggie broth and potatoes: check! No changes there.
Be sure to scrub your potatoes, and leave the skin on for extra nutrition and fiber!
Above: my little veggie scrubby buddy.
Instead of using a quarter of an onion, I used a whole shallot.
I had fresh rosemary on hand, so I used that instead of dried rosemary. Just a sprig should be good enough, but I added just a tad bit more because I love rosemary flavor.
Instead of using three tablespoons of frozen spinach, I used about a half cup. My modified version of the recipe yielded about 8 cups instead of 7.
Finally, I doctored it up with some organic garlic powder, Bragg's nutritional yeast, and seaweed flakes. You could try different things, such as organic cheese or vegan sour cream.