Preheat your oven's broiler setting. Then, spray parchment paper with cooking oil spray.
Break the graham crackers into small, bite-sized pieces by splitting them in half and then half again and once again.
Place the mini marshmallows on top of the graham cracker pieces.
Place the graham crackers and marshmallows on a baking sheet lined with parchment paper.
Broil the graham crackers and marshmallows in the oven for a few minutes, or until they are lightly browned. Keep a close eye on them to prevent burning.
While the graham crackers and marshmallows are in the oven, melt the chocolate chips.
Once the graham crackers and marshmallows are lightly browned, remove them from the oven.
Pour the melted chocolate over the graham crackers and marshmallows on the baking sheet.
Use a spatula to spread the melted chocolate evenly over the graham crackers and marshmallows.
Allow the bark to cool until it hardens. Once the bark has cooled and hardened, break it into pieces and enjoy your delicious graham cracker bark!