Pour crushed graham crackers into a shallow dish. Apply chocolate syrup to rim of mug. Invert and twist each mug into crumbs so they stick to the chocolate syrup/rim.
In a medium sauce pan, heat chocolate milk on medium low for about 5 minutes. Stir frequently.
Pour hot chocolate into mugs then add mini marshmallows. Using a bakers torch, carefully "toast" marshmallow tops. Garnish with chocolate syrup and serve immediately.