Crockpot Chicken Chow Mein

Name: Crockpot Chicken Chow Mein
Ingredients: 1 to 2 tablespoons vegetable oil; 1 1/2 pounds boneless, skinless chicken breasts, cut in 1-inch cubes; 4 medium carrots , thinly sliced; 6 to 8 green onions, sliced, including green; 1 1/2 cups sliced celery; 1 cup low-sodium chicken broth; 1 tablespoon granulated sugar; 1/3 cup light soy sauce; 1/4 teaspoon crushed red pepper flakes; 1/4 teaspoon ground ginger; 1 medium clove garlic, crushed; 1 (8-ounce) can bean sprouts; 1 (8-ounce) can water chestnuts , sliced; 1/4 cup cornstarch; 1/3 cup water