Preheat your air fryer to 400° Fahrenheit. Even if your air fryer doesn't preheat, set it to 400° and let it heat up for 5 minutes.
Make the steak seasoning by combining all of the ingredients in a bowl or jar and mixing well.
Sprinkle the seasoning on both sides of the flank steak.
Place the steak in the air fryer basket. Cook for 10-12 minutes, flipping halfway. Around 10 minutes will result in medium rare steak, cook longer if desired.
Remove the steak and let it rest for 5 minutes.
Slice steak against the grain into strips and serve.
Notes
Nutrition amounts listed are per serving and an estimate provided for those following a Ketogenic or low-carb diet. See our full nutrition information disclosure here.