Makes about 3 cups mix and will coat about 4 pounds of fish.
In a deep skillet, heat 1 1/2 inches of vegetable oil to 375° F. In a small bowl, combine 1 egg and 1 cup buttermilk. Dip fish into egg mixture. Place fish in bag of mix; shake until fish is well coated. Fry until fish is golden brown and flakes easily with fork. Drain on paper towels and serve.