Prepare the breading mixture: Mix 6 tablespoons berasa flour, 4 tablespoons all-purpose flour, 2 tablespoons yam flour, 1/2 tablespoon baking powder, and 1/2 tablespoon chicken stock. Add a little salt and mix with 1 cup of cold water to form a thick batter.
Cut the chicken (thigh or drumstick) into small pieces.
Coat the chicken in the breading mixture and fry twice for extra crispiness: first, shallow-fry until golden brown, then drain on paper towels. For double frying, reheat the oil if needed to ensure a crispy texture.
Melt 1-2 tablespoons of butter or mayonnaise in a pan. Add sliced garlic, curry leaves, and chili peppers, sautéing until fragrant.
Add 1/2 tin full-fat milk and 1 teaspoon condensed milk, then simmer for a moment to blend the flavors.
Season with salt and add 1 teaspoon of sweetened condensed milk; bring the mixture to a boil and reduce heat.
Gently fold in the fried chicken pieces into the buttermilk sauce until well coated.
For an extra kick, sprinkle with chili flakes and sliced red chilies before serving.