The Professional Cut: Slice the chicken breast into paper-thin strips. Cutting at an angle increases surface area for the velvet coating.
Hydrate the Meat: In a bowl, mix chicken with baking soda and 1 tbsp water. Massage until the water is fully absorbed. Repeat this 3 times until the chicken looks plump and pale.
Seal the Moisture: Add salt, light soy sauce, white pepper, 1 tsp oil, and cornstarch. Mix until a very thin, silky film coats each piece.
The Flash Fry: Heat 1/2 cup oil in a wok until shimmering. Fry the chicken on high heat for only 2 to 2.5 minutes.
Drain: Remove the chicken and drain the excess oil, leaving about 2 tbsp in the wok.
Sauté Aromatics: Add garlic, ginger, and chilies to the hot oil. Sauté for 30 seconds until fragrant.
Toss Veggies: Add onions, bell peppers, and scallion whites. Stir-fry on high heat for 1 minute until crisp-tender.
Build the Sauce: Pour light and dark soy sauces around the edges of the wok to caramelize. Add a splash of hot water, vinegar, sugar, and white pepper.
Glaze: Return the fried chicken to the wok. Pour in the cornstarch slurry and toss vigorously until the sauce thickens and glazes the meat.
The Basil Finish: Turn off the heat. Hand-tear the fresh basil leaves and toss them in with the scallion greens. The residual heat will wilt the basil perfectly.
Serve: Plate immediately. This dish is best enjoyed hot while the basil is aromatic and the chicken is at its softest.