Crush the graham crackers into fine crumbs and set aside.
Press a small chocolate square into each marshmallow and reshape to cover the chocolate.
Set up a dredging station with flour, egg and milk mixture, and crushed graham crackers.
Coat each marshmallow in flour, then egg mixture, and finally, graham cracker crumbs.
Heat oil in a deep fryer or pot to 350°F (175°C).
Fry marshmallow bombs for 20-30 seconds or until golden brown. Drain on paper towels.
Serve warm with optional garnishes like powdered sugar or chocolate sauce.