To make, layer the 4 slices of Swiss cheese on top of a tortilla. Add a layer of apple slices. Top with some sliced lettuce or fresh spinach leaves. I used bib lettuce, since that's what I had, but any lettuce would be fine. I just like having that bit of something green. Top with remaining 2 slices of cheese. Cover with the second tortilla, and place in a pan, on medium heat, that has been sprayed with vegetable spray. Cook for several minutes, until the tortilla begins to brown, flip and cook another 2 to 3 minutes.