Toss the baking soda, 1 tablespoon of soy sauce and 2 Tablespoons of cornstarch with the chicken pieces and set aside for 10-30 minutes to marinate.
Blend the sesame oil and vegetable together and set aside for later use.
Prepare the sauce by mixing the ginger, garlic, 2 teaspoons of cornstarch, soy sauce, brown sugar and water. Set aside.
Preheat a large skillet over high heat and add the oil blend. Add the marinated chicken pieces and cook for 2 minutes. Flip the chicken and cook for 1 minute on the other side. You may have to do this in batches depending on the size of your skillet. Add more oil as needed.
Once all of the chicken is seared and golden brown, add the sauce mixture to the pan. Bring everything to a boil, then reduce to a simmer and let cook for 3-5 minutes, stirring frequently. The chicken will register 165 ℉ on a thermometer.
Garnish with scallions and sesame seeds and serve with broccoli and jasmine rice.