Slice the apple into a few thin slices (enough to cover bread).
Slice the cheese thinly to cover the apples.
Thinly coat a pan with vegetable oil or cooking spray.
Put the sandwich together and grill lightly on each side until cheese is melted. It melts better if you put a lid on the pan so the heat gets captured.
You can use whatever is left of the apple to toss with a few greens and some dressing for a side salad.
** Variation: Toast the vegan bread lightly first. Then layer sliced apples and cheese on each piece of vegan bread and put under broiler for an open-face sandwich.