Use a gallon Ziplock bag and add the buttermilk, hot sauce, and seasoning salt. Add the chicken to the Ziplock bag, close it tightly and work the chicken around to ensure it is all coated with the buttermilk. Refrigerate for at least 2 hours.
Remove the chicken from the refrigerator 7-10 minutes before frying to take the chill off. Pour the vegetable oil into a cast iron skillet and heat of medium.
Add the flour to a large bowl and stir in the garlic powder, paprika, Lawry's seasoning salt, and black pepper. Mix well.
Using tongs, remove the chicken from the buttermilk brine one at a time, and dredge it in the flour/ seasoning mixture. Turn it over and ensure both sides are coated well with the flour.
Gently place the coated chicken into the hot oil. Fry each piece of chicken for 5-7 minutes, turn it over and fry an additional 5-7 minutes.
After chicken is golden brown, remove it from the hot oil and place it on a cooling rack that is set over a sheet pan, to drain excess oil.