2In a bowl, combine cornstarch and baking soda, then toss the chicken pieces until thoroughly coated.
3Place each piece of chicken on a chopping board between pieces of cling wrap, and use a rolling pin to pound until paper-thin and slightly translucent.
4In a heatproof bowl, combine the green capsicum, red capsicum, minced garlic, and chopped spring onion. Pour hot oil over them to release their flavor.
5Add sugar, soy sauce, oyster sauce, sea salt, sesame seeds, and chilli oil to the bowl with the aromatics and mix well.
6Bring a pot of water to a boil, then add the Sichuan peppercorns, spring onion, ginger, and cooking wine.
7Cook the chicken in small batches for about one minute until completely white, then remove and transfer directly into the sauce.
8Toss the chicken well in the sauce to coat and serve.