Make the sauce: In a medium bowl, whisk together soy sauce, honey, sriracha, grated ginger, minced garlic, 2 tablespoons sesame seeds, and sesame oil (if using). Set aside.
Prep the chicken: Pat the chicken pieces dry, then toss them in a bowl with the cornstarch, and season with a pinch of salt and a pinch of pepper until evenly coated.
Heat the pan: Warm a large skillet or wok over high heat for about 2 minutes, then add the olive or sesame oil and swirl to coat.
Cook the chicken: Add the coated chicken to the hot pan in a single layer and stir‑fry for 5–6 minutes, turning occasionally, until golden and cooked through.
Add the sauce: Pour the prepared sauce over the chicken and cook, stirring, for 3–4 minutes until the sauce thickens and becomes sticky, coating the chicken.
Finish and serve: Transfer the chicken to a serving dish, sprinkle with chopped spring onions and extra sesame seeds if desired, and serve with hot white rice or noodles.