In a microwave safe bowl, melt butter. Whisk in the rest of the ingredients. Set aside.
Set Air Fryer to high heat.
Cook cauliflower for 5-7 minutes or until slightly browned.
Remove and put into an airtight container. Pour ½ of sauce over the cauliflower, seal lid, and give it a shake.
Put in the air fryer for 3 more minutes.
Remove tray from Air Fryer and spoon the cauliflower onto a serving plate. Pour remaining sauce over the cauliflower, add celery and blue cheese dressing for dipping.
