Chicken with tortillas

1 cup onion , chopped 1 cup green bell pepper , chopped 1 tablespoon butter or 1 tablespoon margarine 1 (14 ounce) can chicken broth 1 (10 3/4 ounce) can[...]

1 (15 ounce) can corn , drained 1 (15 ounce) can black beans , drained and rinsed 1 (14 1/2 ounce) can diced tomatoes (I used the kind with sweet onion in it)[...]