Slice the eggplant into 3-inch long batons.
In a small bowl, combine the water, chicken bouillon powder, sugar, soy sauce, oyster sauce, and cornstarch. Set aside.
Heat a large pan over medium-high heat. Add 1 tablespoon of oil. Add the eggplant and stir until the oil is absorbed mostly absorbed. Add 2 tablespoons of water, cover with a lid, and steam for 60-90 seconds until the water evaporates.
Remove the lid and drizzle another tablespoon of oil all over. Stir fry the eggplant for another 30 seconds. Remove the eggplant to a plate.
Reduce the heat to medium. Add the remaining one tablespoon of oil to the empty wok. Cook the garlic for 30 seconds until it smells fragrant.
Add the sauce mixture and cook until it thickens.
Add back all the eggplant and toss until it is evenly coated in the sauce. Enjoy!