Heat the vegetable oil in a wok or large skillet over medium-high heat. Add the sliced sausage and cook until browned, about 3-5 minutes.
Add the onion, bell pepper, and garlic to the pan and sauté for 2-3 minutes, or until the vegetables are tender.
Add the cooked rice to the pan and stir to combine with the vegetables and sausage.
Season the rice with soy sauce, chilli sauce, salt, and pepper to taste. Stir well to evenly distribute the seasonings.
Cook the rice for an additional 2-3 minutes, stirring occasionally, until it is heated through and slightly crispy.
Garnish with chopped green onions or cilantro if desired, and serve hot.