Slow Cooker Bean & Barley Soup

Ingredients

• 1 tablespoon extra-virgin olive oil

• 1 large onion, diced

• 1 large stalk celery, diced

• 1 large carrot, diced

• 2 cups water

• 4 cups reduced-sodium chicken broth, "no-chicken" broth or vegetable broth (32-ounce carton)

• ½ cup pearl barley

• ⅓ cup dried black beans

• ⅓ cup dried great northern beans

• ⅓ cup dried kidney beans

• 1 tablespoon chili powder

• 1 teaspoon ground cumin

• ½ teaspoon dried oregano

• ¾ teaspoon salt