In a small bowl, mix together 2 tablespoons of water with the oyster sauce, soy sauce, dark soy sauce, and sugar.
Heat the oil in a wok or frying pan over medium high heat. When hot and shimmery, add the garlic and chili, stirring, for about 10-30 seconds – you don’t want them to burn or brown.
Add in the chicken and cook, tossing, until golden brown and cooked through.
Add the sauce and cook until the sauce reduces slightly and coats the chicken.
Remove the pan from the heat and stir in the basil.
Enjoy immediately with fluffy white rice and a crispy egg, if desired.