Heat olive oil in a large soup pot over medium heat. Add onions, red pepper, carrots, garlic, and jalapeƱo. Cook and stir for 5 mins, until veggies begin to soften.
Add all remaining ingredients, except sour cream and cilantro. Bring to a boil. Reduce heat to medium-low and simmer, covered, for 10 minutes.
Transfer soup to a blender or food processor in batches, and puree until smooth. Return to pot.
Top each bowl of soup with a tbsp of sour cream. Garnish with chopped cilantro.