Easy chicken stir fry!
Prep all of your ingredients in advance. Once you start cooking, things move quickly!
Combine marinade ingredients in a medium bowl. Add chicken and let stand at room temperature for 20 minutes.
If serving with rice, start water and rice on stove. Prepare rice according to package directions.
Heat 1 tablespoon of oil in a wok or large skillet over high heat. Remove chicken from marinade (but don't throw out marinade!). Cook until meat is cooked through about 5 minutes. Remove chicken to a plate.
Add remaining tablespoon of oil to pan. Add the onions and mushrooms and cook until brown, stirring frequently, about 5 minutes. Add the bok choy, and cook until tender, about 3 minutes. Add red pepper flakes and water chestnuts, if using. Add remaining marinade and boil for 1 minute.
Add chicken back to the pan. Stir to combine. Serve over rice or rice noodles.