Grilled Ham, Swiss, and Apple Pitas

3 rounds whole-wheat pita bread, cut in half
6 slices Swiss cheese
3 large slices Black Forest ham, cut in half
1 apple, cored and thinly sliced
butter-flavored nonstick cooking spray

Fill each pita half pocket with one slice of Swiss cheese, half a slice of ham, and several apple slices. Spray each side with nonstick cooking spray and grill until lightly browned on each side and cheese begins to melt. Makes 6.