Cut the eggplant and onion into bite-sized pieces.
Add cooking oil to a pan and stir-fry the onion.
When the onion becomes translucent, add the eggplant and stir-fry together.
Add soy sauce, sugar, minced garlic, and chili powder, then stir-fry until the flavors are well absorbed.
Place the stir-fried eggplant over rice.
Drizzle sesame oil and sprinkle sesame seeds on top as desired.