Stir 4 cups broth, the rinsed beans, the thawed sweet potatoes, 1 can tomatoes, the chopped onion, 1 cup corn, 1 tablespoon garlic paste, 1 teaspoon taco seasoning, ½ teaspoon salt, ½ teaspoon chipotle and ¼ teaspoon pepper together in a large Dutch oven. Cover and bring to a boil over high heat.
Uncover, reduce heat to medium and cook, undisturbed, until the sweet potatoes are tender, about 10 minutes.
Stir in softened cream cheese. Bring to a lively simmer, uncovered, over medium heat; simmer for 5 minutes, stirring occasionally, until smooth and the flavors meld. Divide among 6 bowls. Garnish with cilantro, if desired.
