Place the Brussels sprouts in a large bowl with 2 tablespoons of olive oil and toss until they are coated.
Add the Brussels sprouts to the basket of the air fryer and lock it in.
Cook on 350 degrees F for 8 minutes. After 8 minutes remove from the air fryer and toss the sprouts so they shift around, then place them back in the fryer for 8 minutes more.
While the sprouts are cooking whisk together 1 tablespoon olive oil, salt, lemon juice, garlic, and crushed red pepper flakes.
When the Brussels sprouts come out of the air fryer place them in a bowl , pour the dressing over them and toss to coat.