Smoky Sausage and Rice Soup

Name: Smoky Sausage and Rice Soup
Ingredients: 3 tablespoons extra-virgin olive oil; 3 chicken and/or turkey andouille sausages (about 12 ounces), halved lengthwise and sliced; 4 scallions, chopped (white and green parts separated); 1 stalk celery, chopped; 1 red bell pepper, chopped; 3 cloves garlic, finely chopped; 1 teaspoon Cajun seasoning; 4 cups low-sodium chicken broth; 1 cup long-grain white rice; 1 14-ounce can no-salt-added diced tomatoes; 1 bay leaf; Kosher salt; Cornbread, for serving