Chef John's Buttermilk Fried Chicken
The oil is 350 degrees F (175 degrees C) to start, but when the chicken goes in it will drop to about 300 degrees (150 degrees C). It should rise back to 305-310 degrees F (155 degrees C) and be held at that temperature until done, about 20 minutes.
The nutrition data for this recipe includes the full amount of buttermilk. The actual amount of buttermilk consumed will vary.