01 - Preheat broiler or set up a grill to medium heat.
02 - Arrange all graham cracker squares on a tray. Place one chocolate square on each of four crackers.
03 - Top each chocolate square with a large marshmallow.
04 - Place assembled crackers under the broiler or on the grill for 1 to 2 minutes, closely monitoring until marshmallows are golden and softened.
05 - Layer 2 to 3 apple slices over each warm marshmallow.
06 - Spoon 1 tablespoon caramel sauce over the apples on each stack. Sprinkle with ground cinnamon, if using.
07 - Top with remaining graham crackers and gently press to create sandwiches.
08 - Present immediately while stacks are warm and marshmallows are gooey.