Add potatoes and chicken broth and bring to a boil. Reduce heat and simmer for 20-25 minutes.
Remove soup from heat and add yogurt. Puree with an immersion blender (or a regular blender for a smoother soup). Top with parsley or cilantro and serve soup with an additional dollop of yogurt and/or pumpkin seeds/pine nuts. (I used yogurt but held the pumpkin seeds).
Recipe by In Good Taste at http://ingoodtaste.kitchen/sweet-potato-soup/