Start by adding the cleaned crappie fillets to a medium mixing bowl.
Pour buttermilk over the fillets, and cover with cling wrap before placing in the refrigerator for at least 2 hours.
Add the corn meal, flour, salt, pepper, baking soda, garlic powder and cayenne pepper to a separate medium bowl, whisking 'til well combined.
After the 2 hours is up, heat about 1 inch of vegetable oil in a 9-inch cast iron skillet until it reaches 350ºF with a meat thermometer.
Remove your fish fillets from the refrigerator, and toss each one in the flour mixture 'til both sides are evenly coated.
Fry 3-4 crappie fillets at a time, about 2 minutes on each side, 'til golden brown and the internal temperature reads 145ºF with a meat thermometer.
Remove from the skillet and transfer to a paper towel lined plate. This will help soak up excess oil from frying.
That's it! Serve with a wedge of lemon, and garnish with chopped parsley.