Homemade Chicken Chow Mein

Name: Homemade Chicken Chow Mein
Ingredients: 3 tablespoons of margarine; 1 large onion, sliced; 3 stalks of celery, sliced; 2 large red bell peppers, sliced; 8 ounce container of button top mushrooms, sliced; 12 oz. bags fresh bean sprouts; 1 can (~1 ½ cups) baby corn, drained and chunked; 2 cans sliced water chestnuts, drained; 2 cans bamboo shoots, drained; 8 cups fat free low sodium chicken broth; 2/3 cup low sodium soy sauce; 1 tablespoon minced garlic; 18 oz. cooked rotisserie chicken – skin & bone removed, chunked; 1/2 cup water; 3/4 cup cornstarch; 1 tsp Garlic powder (can adjust to taste); 1 tsp Ground ginger (can adjust to taste); 1 tsp Salt (can adjust to taste); 1 tsp Pepper (can adjust to taste)