The amounts given here will feed one person but you could safely double the amount for two.
Heat up your wok and add the oil, peanut oil is recommended but I usually just use regular vegetable oil. Add the chicken and quickly sear it on all sides, add the garlic and chilli. An ‘authentic’ recipe would use crumbled dried red chilli (prik haeng) but I prefer the fresh chilli, you could certainly add some dried chillies or chilli flakes if you would like some extra heat but I enjoy the freshness of this.