Whisk together the garlic, spring onion, sugar, five-spice powder, fish sauce, soy sauce, chilli sauce and salt in a bowl. Arrange the chicken pieces in a shallow, non-metallic dish. Spoon the sauce mixture over the chicken to evenly coat. Cover the dish with plastic wrap and refrigerate 8 hours or overnight.
Preheat oven to 220 degrees C. Lightly grease a baking tray.
Arrange the marinated chicken on the prepared baking tray.
Bake in the preheated oven until crispy, about 45 minutes. Serve with lime wedges on the side.