Heat 1 tbsp Vegetable oil in a pan over medium-high heat.
Add the Chicken thighs and stir-fry for 3–4 minutes until golden. Remove from the pan and set aside.
Add the remaining Vegetable oil, Garlic, Lemongrass, Banana shallot and Red chilli. Stir-fry for 1–2 minutes until fragrant.
Return the Chicken to the pan and toss to combine with the aromatics.
Add the Fish sauce and Sugar. Stir-fry for a further 3–4 minutes until the Chicken is fully cooked through and evenly coated.
Remove from the heat and garnish with the Spring onion.
Serve immediately with steamed Jasmine rice.