Cut the chicken into small pieces.
Mix together in a bowl: 6 tablespoons rice flour, 4 tablespoons wheat flour, 2 tablespoons cornflour, 1 egg, 1/2 teaspoon baking powder, and TUMIX Perencah Pati Ayam (if using).
Season with seasoned salt. Mix well until the batter has reached an appropriate consistency.
Fry the chicken pieces in hot oil until crispy. Double frying may be necessary for extra crispiness.
Prepare the Mongolian sauce by mixing 1/2 tablespoon sugar, 2 tablespoons oyster sauce (Kicap Lemak Manis), 1/2 teaspoon TUMIX Perencah Pati Ayam, and 1/2 teaspoon cornflour with 1/2 cup water. Stir until well combined.
Fry the ginger, dried chili peppers, galangal, and scallions in a wok until fragrant.
Add the Mongolian sauce to the wok and stir-fry for a bit more until it thickens slightly.
Return the fried chicken pieces to the wok and mix well. Cook until everything is heated through and well combined.
Allow the dish to cool slightly before serving.