Chinese Lo Mein

Name: Chinese Lo Mein
Cuisine: Asian, Chinese
Ingredients: 400g fresh egg noodles (or dried noodles, cooked and drained); 200g chicken breast or shrimp (optional), sliced thinly; 1 bell pepper, julienned; 1 carrot, julienned; 1 cup mushrooms, sliced; 1 small onion, sliced; 3-4 baby bok choy, chopped; 3 cloves garlic, minced; 1-inch piece of ginger, minced; 2 tbsp vegetable oil (for stir-frying); 2 tbsp light soy sauce; 1 tbsp dark soy sauce; 1 tbsp oyster sauce; 1 tsp sesame oil; 1 tsp sugar; 1/4 cup chicken broth or water