Wash the napa cabbage thoroughly and cut it into large pieces.
In a bowl, mix soy sauce, minced garlic, chili powder, sugar, and sesame oil to make the sauce.
Layer the napa cabbage in a deep pan or pot.
Evenly pour the sauce over the cabbage.
Cover with a lid and steam over medium-low heat for 15~20 minutes.
Transfer the finished steamed cabbage to a plate and serve.