Combine the flour, pepper, salt, Cajun seasoning and onion powder in a bowl (I like to use a pie plate).
Beat the eggs in another bowl. Add the evaporated milk and beat to combine.
Working in batches, dip the shrimp in the egg mixture. Shake off excess then roll in the flour mixture. Shake off excess. Fry 2 minutes or until golden brown. Remove to a paper towel-lined plate.