Preheat oven to 375°F.
Crush 4 sheets of graham crackers.
Spray non-stick cooking spray in a small cast-iron skillet.
Start with a small layer of crushed graham crackers, then place a layer of chocolate bar overtop.
Make a layer of mini marshmallows followed by adding another layer of crushed graham crackers.
Continue with another layer of mini marshmallows and sprinkle in chocolate chips.
Cover with another layer of crushed graham crackers and top with layer of large marshmallows.
Place in oven for 5 minutes.
Remove from oven and drizzle chocolate syrup on top.
Use whole graham crackers to dip and enjoy!