Colorful Chicken Stew

Colorful Chicken Stew
1 (14 1/2 ounce) can Italian diced tomatoes, undrained
1 large onion, chopped
1 medium green bell pepper, chopped
1 pound boneless skinless chicken breasts, cubed
1 tablespoon cornstarch
1 teaspoon chili powder
1/4 teaspoon pepper
2 (4 ounce) cans mushroom stems and pieces, drained
2 cups cold water
2 low-sodium chicken bouillon cubes
2 medium potatoes, peeled and cut into 1/2-inch cubes
3 celery ribs, chopped
5 medium carrots, chopped
Artificial Sweetener equal to 2 teaspoon sugar
In a 5-quart crockpot, combine the first 12 ingredients. In a small bowl, combine cornstarch and water until smooth. Stir into chicken mixture. Cover and cook on LOW for 8 to 10 hours or until vegetables are tender.