Preheat the air fryer by running it for 5 minutes at 390°F (200°C).
Add the frozen brussel sprouts to the air fryer basket and air fry for 9 minutes at 390°F (200°C).
Meanwhile, make the vinaigrette by whisking together all the vinaigrette ingredients in a large bowl.
Place the brussel sprouts in the bowl with the vinaigrette and mix well to coat.
Place the brussel sprouts back in the air fryer basket and air fry for 6 minutes at 390°F (200°C), shaking the basket once halfway.
Transfer to a serving bowl or platter and top with slightly crushed salt flakes just before serving. Enjoy!
