10-14graham cracker sheets, depends on the size of your baking sheet
¾cuplight brown sugar
8ouncessemisweet chocolate chips
10ouncesmarshmallows, mini or large
Preheat oven to 350° F.
Line cookie sheet with graham crackers - you may need more or less depending on the size of the baking sheet you're using.
In a small saucepan over medium heat, combine butter and brown sugar and stir frequently. Remove from heat as soon as it comes to a boil, then pour mixture over graham crackers on prepared baking sheet. Use a spatula to spread it as evenly as possible.
Place in oven to bake for 2-3 minutes.
Remove from oven and immediately cover with chocolate chips. Let it set for a few minutes to melt from the residual heat, and then use a spatula to spread it evenly.
Top with marshmallows to cover the surface (you won't be able to use a spatula to spread this layer) and place back in the oven for 3 minutes.
Turn the oven to broil and remove the pan once the tops of the marshmallows are golden brown.
Place the completed bark in the fridge until it has set, and then cut into pieces and serve. Enjoy!