Start by making the sauce for the chicken. In a bowl, mix together the soy sauces, sesame oil, oyster sauce, brown sugar, vinegar, and cornstarch.
In a large wok or deep saucepan, heat the vegetable oil over high heat until shimmering.
Add the ginger, garlic, and white part only from the green onions. Fry for 1 minute until fragrant. Do not let the garlic burn.
Add the ground chicken and fry, stirring constantly, until no longer pink, about 6-7 minutes.
Lower the heat to medium. Add in the soy sauce mixture and stir until chicken is coated. Add in the green parts of the green onions.
Allow the chicken to bubble for a minute or two in the sauce and then remove from heat. The sauce will thicken as it cools.