Mix together 1 tablespoon water with 1 tablespoon cornstarch. Set aside the cornstarch slurry for later.
Toss cubes of chicken with remaining 2 tablespoons cornstarch and season with salt and pepper as desired.
In a large skillet heat oil over medium-high heat. Add chicken, cook for 5-6 minutes browning on all sides, it should not be fully cooked, just lightly browned.
Meanwhile mix together all of the ingredients for the sauce.
Pour sauce over chicken, simmer for 4-5 minutes until chicken is fully cooked. Mix in the cornstarch slurry and cook for 1-2 minutes until it starts to thicken.