Outstanding! So glad I read the comments first. Based on those, I substituted sweet potato for the potato and omitted the hot sauce. Rather than using four cups of chicken broth and two cups of water, I instead simply used six cups of chicken broth. I also added one cup chopped kale, one 10-oz can of Rotel diced tomatoes and chilies (including the juice), one 10-oz can of Rotel diced tomatoes with lime juice and cilantro (including the juice), one 15-oz can white beans (drained), and one tablespoon of lime juice. I served with sour cream to help cut the spice.
Next time, I think I'll add one 15-oz can of whole kernel corn and some shredded chicken. I'd also serve it with avocado slices, chopped peanuts (if the peanut butter is creamy), green onions, and tortilla chips.
A new favorite, I can already tell! Thank you, fellow commenters!