Brush each fillet with oil.
Season with cajun seasoning. Many cajun seasoning blends include salt, so be sure to check yours before adding salt.
Place fillets into the air fryer basket. Adjust the temperature to 390°F and set the timer for 7 minutes.
When fully cooked, internal temperature will be 145°F. Serve immediately with a squeeze of lemon.
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.