1 tablespoon olive oil
1 large onion, chopped
2 stalks celery, chopped
2 carrots, chopped
6 cloves garlic, chopped
1 tablespoon ground cumin
2 tablespoons chili powder, or to taste (optional)
2 teaspoons maple syrup (optional)
1/4 teaspoon ground black pepper
4 cups vegetable broth
2 (15 ounce) cans black beans, drained and rinsed
2 (15.5 ounce) cans canned red beans, drained and rinsed
1 (15 ounce) can whole kernel corn, with liquid
1 (14.5 ounce) can crushed tomatoes, with liquid