How to make ridge structure of crispy chicken
In many places cornflakes are very cheap, I am assuming where you are they are expensive because they are imported. You aren't going to be able to get the ridged structure without something like cornflakes because it's the flakes themselves that give the breading that texture. You need to find something that you can afford, perhaps another cereal that is similar to cornflakes would work, it all depends on what you have in the stores. If you can find them Panko breadcrumbs would give you a nice texture, not the same as cornflakes but pretty good. Otherwise I suggest you go shopping and see what you can find.