1 tablespoon olive oil
1 large onion, chopped
2 carrots, chopped
1 stalk celery, chopped
4 cloves garlic, chopped
2 tablespoons chili powder
1 tablespoon ground cumin
1 pinch black pepper
4 cups vegetable broth
4 (15 ounce) cans black beans, undrained, divided
1 (15 ounce) can whole kernel corn
1 (14.5 ounce) can crushed tomatoes
Heat olive oil in a large pot over medium-high heat. Sauté onion, carrots, celery, and garlic in hot oil for 5 minutes. Season with chili powder, cumin, and black pepper; cook for 1 minute. Stir in vegetable broth, 2 cans beans, and corn. Bring to a boil.
Meanwhile, process remaining 2 cans beans and tomatoes in a food processor or blender until smooth. Stir into boiling soup, reduce heat to medium, and simmer for 15 minutes.