Prepare the ingredients for the air fryer cod fillets. Pat the fillets dry with a paper towel, then season them with your favorite all purpose seasoning.
Brush the air fryer basket with oil. Place the fillets in the basket. Top them off with butter and lemon slices.
Cook the cod in the air fryer at 400°F for 10-13 minutes, depending on the size of fillets. The internal temperature should reach 145 °F when fully cooked.
Notes
I love to use garlic parsley salt, but any all purpose seasonings can be used here- johnnys, lawrys, old bay, etc.