Preheat your oven to 350 degrees F.
Place 8 graham crackers on a silicone or parchment lined baking sheet. Add marshmallows on top of each graham cracker. Place into heated oven for 5 minutes or until marshmallows are desired gooey-ness.
While graham crackers + marshmallows are in oven, set remaining 8 graham crackers on a plate or paper towel. Smooth about 1 Tablespoon (more or less) over graham cracker in a clean layer.
Remove marshmallow + graham crackers from oven and immediately smoosh chocolate covered graham cracker on top.
You can enjoy these immediately or place in the freezer for a chilly s'mores cookie later!