Heat the canola oil in a skillet over high heat. Cook and stir the eggplant until soft, about 4 minutes. Stir in the water, red pepper flakes, and garlic powder. Cover and simmer until all the water is absorbed. Meanwhile, mix sugar, cornstarch, soy sauce, and oyster sauce in a bowl until sugar and cornstarch have dissolved. Stir sauce into the eggplant, making sure to evenly coat the eggplant. Cook until the sauce has thickened.
