For the lemon capers sauce
For the tilapia
Preheat the air fryer to 415˚F and spray the basket of your air fryer with cooking spray.
Whisk together the sea salt, garlic powder, and ground black pepper and set aside.
Drizzle the olive oil over the tilapia and massage it into the fish, coating it evenly.
Arrange the tilapia fillets in the basket with at least ½ inch of space between each fillet. If the basket is too small, cook the fish in batches.
Sprinkle half of the seasoning over the fillets. Flip, and sprinkle with the other half of the seasoning.
Air fry for 6 minutes; flip the fish halfway through the cooking time.
For the lemon capers sauce
Meanwhile, make the sauce and start by melting the butter in a saucepan set over medium heat.
Add the garlic and sauté for about 15 seconds or until fragrant.
Whisk in the lemon juice to combine, then stir in the capers. Remove from heat.
Remove the tilapia from the air fryer and arrange the fillets on a serving platter.
Spoon the sauce over the cooked tilapia and serve.