Preheat your air fryer temperature to 400 degrees F for 3–5 minutes to ensure even cooking and a crispy finish.
Lightly spray frozen haddock fillets with cooking spray or brush with a little oil. Season with salt, pepper, paprika, or your favorite spices.
For extra crispiness, you can sprinkle panko breadcrumbs or crushed cornflakes over the fillets and press gently to adhere.
Place the fillets in a single layer in the air fryer basket, leaving space between them for proper air circulation.
Air fry for 12–15 minutes at 400°F, flipping halfway through. The fish is done when golden, crispy, and flakes easily with a fork, with an internal temperature of 145°F.
Remove from the air fryer and let rest 1–2 minutes. Serve immediately with lemon wedges, tartar sauce, or your favorite sides.