The key to a perfect tuna melt is choosing really good fresh bread. I like using sourdough or rye bread but you can use whatever you have on hand, just make sure it’s fresh.
Add two slices of cheese on each slice of bread, add about 1/2 cup of the tuna salad on top of the bread, and then cover with the other slice of bread.
Place them in the air fryer basket butter-side-down and cook at 400 degrees F for 5 minutes. Once the 5 minutes are up, flip the sandwich and cook for an additional 3 minutes.