Toss the chicken with the soy sauce, rice vinegar, white pepper, cornstarch, and garlic powder. Let it marinate for at least 15 minutes.
Whisk the rice flour, cornstarch, all-purpose flour, and water into a smooth, pourable batter. Dip the marinated chicken pieces to coat.
Heat oil to about 170 C / 340 F. Fry the chicken in batches until golden and crisp, 4-5 minutes. Drain; for extra crunch, fry a second time for 1-2 minutes, then drain.
In a wide pan, melt the butter over medium heat. Add the curry leaves and chopped chillies and fry until the leaves are fragrant and crackling.
Add the minced garlic and cook until just golden. Stir in the mashed salted egg yolks and cook 1-2 minutes until the sauce turns foamy and sandy.
Pour in the evaporated milk and simmer gently, stirring, until the sauce is creamy and lightly thickened.
Add the fried chicken and toss until every piece is glossy and coated. Serve hot with steamed rice.
From @she.eats.icook on Instagram (JJ). The reel has no spoken or written method, so these directions are the standard salted egg chicken technique built from her ingredient list and the frying/tossing shown on screen.