1/2 - 2/3 cup spicy crab boil powder can be used as the alternative to salt & cayenne pepper.
Mix egg, salt, and pepper (or crab boil powder) in large bowl.
Add 2 cups of flour and water and whisk. You might have to add more water to get the batter to light pancake or english pancake batter consistency. I would guess anywhere between 2-3 cups water. This will be thick but runny.
Marinate the chicken in the wet batter for a couple hours.
Get your grease up to 375 degrees.
Place your chicken in plain flour You might need few cups to keep it from getting clumpy. Shake and get them out the flour and into the grease pretty quick(do not let them sit in the flour long, it will make the crust like concrete). Change flour if it gets too clumpy.