chicken lo mein recipe

- 8 ounces lo mein noodles (or spaghetti) - 2 tablespoons vegetable oil - 1 pound chicken breast, thinly sliced - 2 cloves garlic, minced - 1 tablespoon ginger, minced - 1 red bell pepper, thinly sliced - 1 carrot, julienned - 1 cup snow peas - 1 cup sliced mushrooms - 3 green onions, sliced - 1/4 cup soy sauce - 2 tablespoons hoisin sauce - 1 tablespoon oyster sauce - 1 tablespoon sesame oil - 1 teaspoon cornstarch (optional, for thickening) - 1/4 cup water (optional, for sauce) - Sesame seeds (for garnish, optional)