Marinate the cubed chicken with the marinade ingredients in a big bowl for at least 30 minutes (if you can spare it. If not, it's fine to continue on to the next step!)
Heat the oil in a skillet or wok over medium high heat. While the oil is heating up, stir and mix the egg into the chicken bowl. Add the cornstarch and continue mixing until the chicken is coated and there is very little dry cornstarch left.
Spread the chicken pieces out evenly and fry for about 2 minutes or until browned and crispy on the bottom side. Flip the chicken to brown the other side and fry for another 2 minutes or until browned and crispy on the bottom side. Depending on how big your skillet or wok is, you may need to shallow fry the chicken in batches.
Transfer the chicken to a paper towel lined plate (to soak up extra grease).
Serve with ketchup, ranch dressing, or your favorite condiment!