Marinate chicken with oyster sauce and light soy sauce. Set aside.
Whisk together oyster sauce, dark and light soy sauces, coconut sugar, fish sauce, siracha and water to make the sauce.
If using fresh rice noodles, microwave for 3 minutes then carefully separate. If using dried rice noodles, soak for 4 minutes in boiling water.
Stir-fry chicken in 1 tbsp oil over medium high heat for 4-5 minutes until charred and cooked through. Remove from pan.
Add 1 tbsp oil, then add garlic, shallots and chilli. Stir for 1-2 minutes until fragrant. Add red pepper, carrot, and broccoli stems. Stir-fry for 3 minutes, add broccoli leaves, cook for 2 more minutes until wilted. Remove from pan.
Over very high heat, add noodles to the pan and fry for 30 seconds. Add sauce and gently toss for 2 minutes. Add chicken and veggies back to the pan along with spring onions and Thai basil. Stir until glossy.
Plate hot and fresh with chilli oil.
