Toss the chicken with the cornflour until evenly coated. Heat the oil in a large frying pan over medium-high heat.
Add the chicken and cook for 7–9 minutes, turning regularly, until golden and cooked through. You may need to do this in two batches so the chicken browns rather than steams.
Meanwhile, combine the Lee Kum Kee Gluten Free Soy Sauce, and Lee Kum Kee Gluten Free Panda Brand Oyster Sauce, honey, rice vinegar, garlic and ginger in a small bowl.
Return all the chicken to the pan if cooked in batches. Pour over the sauce and cook for 2–3 minutes, tossing frequently, until the sauce has reduced to a thick, glossy glaze that coats the chicken.
Transfer to a serving platter and scatter with the toasted sesame seeds and spring onions.