I saw this yum yum sauce posted in GusRobin's post and thought I would look it up. Found a recipe and made a half batch of this stuff.
Got the Air Fryer out and cooked up two frozen chicken burgers for 15 minutes @ 360F.
Had some mushrooms and added them to the fryer to cook for a few minutes to be added to the burger.
Used cheese buns, lettuce, tomato and swiss cheese slices.
Made a very nice tasty chicken burger. I like that Yum Yum sauce also