Black Bean Sweet Potato Soup

1 yellow or red bell pepper , chopped

1-2 tsp. ground coriander

1-2 tsp. cumin

2 (14 oz.) can black bean s, rinsed and drained

1 (14 oz) can diced tomato es

1-2 cups corn Salt & pepper

1 qt. chicken broth

1/2 qt. beef broth (could probably just use chicken or beef - it's what I had)

1/2 (14 oz.) can tomato sauce

1 large or 2 small sweet potato es, peeled and diced Sour cream Lime wedges