Cut the eggplant and chicken breast into bite-sized pieces.
Finely chop the onion and green onion.
Heat cooking oil in a pan and stir-fry the chicken breast.
When the chicken breast is cooked, add eggplant and onion, then stir-fry together.
Season with soy sauce, oyster sauce, and pepper.
Place the stir-fried ingredients over rice, garnish with green onion, and serve.