Begin by patting the 1 pound cod filets dry using a paper towel.
In a small bowl, combine the 2 teaspoons lemon zest, 1 tablespoon lemon juice, 1 teaspoon black pepper, 1 teaspoon olive oil, 1/2 teaspoon garlic powder, and1/2 teaspoon Kosher salt, mix well.
Brush or rub the seasoning mixture generously over both sides of the cod fillets. Let the fillets marinate for about 10-15 minutes to soak in the flavors.
Set your air fryer temperature to 375 degrees F (190°C), preheat for 3-5 minutes.
Once preheated, place the marinated cod fillets in the air fryer basket, ensuring they are not overlapping. Set cook time for 10-12 minutes, flipping halfway through.
The cod is ready when it easily flakes with a fork and has a translucent-to-opaque color. If unsure, you can use a meat thermometer – the internal temperature should read 145°F (63°C).
Once cooked, transfer the cod fillets to a serving plate. Drizzle any remaining lemon-pepper mixture or a squeeze of fresh lemon juice over the top. Garnish with 1/2 teaspoon parsley.