Ayam masak covers all the everyday chicken dishes your mum cooks, kunyit, halia, serai, kicap. They land around 250 to 300 calories for a piece, which is honestly reasonable, because the chicken is mostly protein. The calories that creep in are the skin, the oil it is fried in, and the sugar in the kicap manis braise.
Of the lot, ayam masak halia (ginger) tends to be the lightest and ayam masak kicap the heaviest, because kicap manis is loaded with sugar. None of them are bad choices though. Pair any of them with rice and vegetables and you have a balanced plate, which is more than most hawker food gives you.