Add the cauliflower to a large bowl and toss with the avocado oil, salt, and pepper.
Place the cauliflower in the air fryer basket and air fry it for 15 to 20 minutes on 390 degrees, or until the cauliflower has wilted and started to soften.
Remove the cauliflower from the air fryer basket and return it to the mixing bowl. Add the sweet chili sauce to the cauliflower and toss to combine.
Return the basket to the air fryer and reduce the heat to 360 degrees and cook for another 10 to 15 minutes, until the cauliflower is crisp-tender.