This recipe came to me via A Year of Slow Cooking. In my opinion, this is one of the best cooking blogs/websites around. Stephanie almost always has great recipes that are easy and delicious. I would highly recommend you check it out.
I didn't follow the recipe exactly, but it still turned out great. I was out of spinach and potatoes, so I just stuck to the beans and veggies I had on hand, but I feel like you could put almost any combo of vegetables in here and it would still taste good. I also only used half a jar of leftover pesto from a recipe I made last week. Since KB is also weird about things being meat free, I added in some cubed ham and it gave the whole soup a nice smoky flavor.
Overall, it's a winner.