Line a 9x13 inch baking sheet with parchment paper. Place the 11 Graham crackers in a single layer on top of the baking sheet, breaking them into squares or rectangles if necessary.
In a medium microwave safe bowl, microwave the chocolate chips and the coconut oil in 30 second intervals, mixing until smooth.
Using a rubber spatula, spread the melted chocolate on top of the Graham crackers.
Sprinkle the mini marshmallows on top of the melted chocolate. Gently press them into the melted chocolate so that they are secure. Sprinkle some Graham cracker crumbs on top. Place in the fridge to harden.
Once hardened, cut the bark into pieces.
Notes
To store this bark, place in an airtight container and store in a cool dry place at room temperature for 5 days, or in the fridge for up to 2 weeks.
Instead of microwaving the chocolate, use the double boiler method! Simmer around 1-2 inches of water in a medium saucepan and place a heatproof bowl on top. Add the chocolate to the bowl, and mix until melted. With this method, you do not need the coconut oil.
Make sure to press the toppings into the melted chocolate to ensure that they don't fall off the bark once the chocolate has hardened.
Don't have coconut oil? You can replace it with either butter or vegetable shortening.