Jambalaya Stuffed Peppers

Name: Jambalaya Stuffed Peppers
Ingredients: 6 large green, yellow, or orange bell peppers; 1 ½ pounds boneless, skinless chicken thighs, trimmed and cut into 1-inch pieces; 2 tablespoons salt-free Cajun seasoning (see Tip), divided; 2 tablespoons olive oil, divided; 1 link andouille sausage (3-4 oz.), sliced; ½ cup diced celery; 1 small onion, diced (1/2 cup); 2 cloves garlic, minced; ½ teaspoon salt; 1 (14 ounce) can diced tomatoes; ¼ cup tomato paste; 1 cup low-sodium chicken broth; 1 cup uncooked instant brown rice