Take two pieces of bread and spread butter on the 1 side of each slice of bread.
Place one slice of bread butter side down in the air fryer. Add cheese, then top with the other slice of bread (with the butter face up).
Air fry at 400 degrees F for 4 minutes. Flip, and air fry for another 4 minutes. Slice and enjoy.
Notes
You can use any type of bread or cheese you like.
Cheese slices work really well in this recipe. However, you can use shredded cheese if you prefer. I do like shredding myself, as it seems it melts better than the preshredded kinds in the bags, as those typically have stuff added to them to prevent them from sticking together (which can affect melting).
If you have any cheese kinda over the edge of the bread, it may get a little burnt. Ideally you want the cheese to be completely covered by the bread.
You can make multiple sandwiches at one time! As many as fit in your air fryer.
Do not preheat your air fryer when making grilled cheese in your air fryer.