Stir syrup, cocoa and milk together in a bowl; then, stir in the chia seeds.
Divide mixture into jars, give mixture another stir, then place the pudding in the refrigerator for at least 2 hours, but preferably overnight.
Before serving: top the jars with marshmallows, then use your Bernzomatic torch to toast the marshmallows to your liking. Sprinkle them with graham cracker crumbs and enjoy!