When it comes to creating a crispy batter for frying, there are a few things you need to take into account. First of all, the type of flour you use is important. A light and fluffy flour, such as self-rising or cake flour, will create a crispier batter than a heavier flour like all-purpose.
Another thing to consider is the amount of fat in the batter. A higher fat content will make for a crispier coating, so if you're looking for extra crunch, go for a recipe that uses butter or oil in the batter. Finally, be sure not to over-mix your batter - too much stirring will result in a tough and rubbery finish.