Mix flour and seasonings in a flat dish such as a pie plate.
Add and heat avocado oil (about 1/2 an inch deep) in cast iron skillet to between 350-375 degrees (you can use a meat thermometer.)
Dip cubed fish into egg mixture, then into flour mixture, carefully place in oil without crowding the pan. (I like to leave about an inch between pieces.)
Fry, turning only once until even browned, about 2-5 minutes depending on the thickness of your filets. (Use meat thermometer to check internal temperature to be 145 degrees Fahrenheit)
Drain on a mesh screen (or paper towels if you use them).
Notes
Enjoy with your favorite potatoes, coleslaw, on top of a salad, or in a French bread or baguette as a fish sandwich - makes a delicious filling for a Po'Boy!