napa cabbage recipe

- 1 head Napa cabbage, chopped - 1 tablespoon vegetable oil - 2 cloves garlic, minced - 1 small onion, thinly sliced - 1 carrot, julienned - 1 bell pepper, thinly sliced (any color) - 1 tablespoon soy sauce - 1 tablespoon oyster sauce (optional) - 1 teaspoon sesame oil - Salt and black pepper to taste - 1 teaspoon sesame seeds (for garnish, optional) - Chopped green onions (for garnish, optional)