Marinate the chicken with the oyster sauce, curry powder and cornflour for 15 minutes.
Deep fry the chicken until golden brown and crispy, then remove and drain.
Melt the butter in a wok and saute the minced garlic until fragrant.
Add the bird's eye chilies and curry leaves and fry briefly until aromatic.
Pour in the evaporated milk, then add the sugar and salt. Simmer gently.
Return the fried chicken to the wok and stir fry until the sauce thickens and coats the chicken.
Serve hot with white rice.
By @yukichewcooks. The reel is video-only (no written recipe) so the quantities here were read off the on-screen captions. 'Buttermilk' here is the Malaysian butter + evaporated-milk sauce, not cultured buttermilk.