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Combine chicken, soy sauce, Shaoxing wine, and cornstarch in a medium-sized bowl. Gently mix by hand until the chicken is coated with a thin layer of the mixture. Marinate for 10 to 15 minutes.
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Combine all the sauce ingredients in a small bowl. Mix well and set aside.
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Heat 1 tablespoon of oil in a large skillet over medium-high heat until hot. Add the chicken. Immediately spread the chicken into a single layer using a spatula, with as little overlap as possible. Sear for 1 minute or so, until the bottom is lightly browned. Flip the chicken. Cook for 30 seconds to 1 minute. Stir occasionally, until both sides are browned but still a bit pink inside. Transfer the chicken to a plate and set aside.
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Add the remaining 1 tablespoon of oil to the skillet. Add the ginger and garlic. Give it a quick stir until fragrant. Add the white onion and peppers. Stir and cook for 20 seconds.
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Stir the sauce mixture until the cornstarch is dissolved completely, and pour it into the skillet. Stir with a spatula immediately and cook until the sauce thickens enough to coat the back of a spoon, a few seconds. Add back the cooked chicken. Quickly stir a few times to coat everything with the sauce. Turn off heat and remove the skillet from the stove. Immediately transfer everything to a big plate so the ingredients won’t keep cooking in the hot skillet.