Core your pineapple and slice into rings about ¼ inch thick.
Preheat your air fryer at 400 degrees F for 5 minutes.
Mix the brown sugar and cinnamon together in a small bowl.
Place pineapple slices in your air fryer basket and sprinkle lightly with brown sugar/cinnamon mixture (note: leave enough to sprinkle the other side and you most likely will have some leftover after sprinkling both sides).
Cook at 380 degrees F on the first side for 7-8 minutes, then flip.
Cook an additional 7-8 minutes.
Plate and serve as desired (I love ice cream and lime zest).
Notes
All air fryers cook differently. Check frequently to see if your pineapples are done yet.
Make sure to cook the pineapples in a single layer and don't crowd.
While it can be tempting to put a lot of brown sugar/cinnamon on the pineapples, pineapples are also naturally sweet. A sprinkling of the mixture works better than putting on too much.
If possible, try to cut all pineapple slices the same thickness so they cook evenly.
To make this recipe really easy, buy pre-sliced, pre-cored pineapple. That can be pricier though, so it is more economical to slice a pineapple yourself.