Brush each tuna steak with oil and sprinkle with garlic powder.
In a large bowl, mix salt, pepper and sesame seeds and then press each tuna steak into them, covering the steak as completely as possible. Place tuna steaks into the air fryer basket.
Adjust the temperature to 400°F and set the timer for 8 minutes.
Flip the steaks halfway through the cooking time. Steaks will be well-done at 145°F internal temperature. Serve warm.
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* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.