Line a baking sheet or tray with parchment paper to prevent the bark from sticking.
Melt the milk chocolate chips using a microwave-safe bowl or in a double boiler on the stovetop, stirring occasionally until smooth and fully melted.
Pour the melted chocolate onto the prepared baking sheet, spreading it evenly with a spatula to form a thin and even layer.
Sprinkle the mini marshmallows generously over the melted chocolate, ensuring they are evenly distributed.
Sprinkle the crushed graham crackers on top of the marshmallows, pressing them gently into the chocolate to adhere.
Place the baking sheet in the refrigerator and let the bark chill for at least 1 hour or until firm and set.
Once set, remove the bark from the refrigerator and break it into irregular pieces or cut it into neat squares.
Serve and indulge in the delightful combination of smooth chocolate, gooey marshmallows, and crunchy graham crackers. Enjoy!