Preheat oven to 350F and prepare a parchment lined 9x9" baking pan.
In a large mixing bowl, follow your brownie mix as per instructions on the bowl and properly combine together.
Once properly combined, add in your mini marshmallows and roughly chopped graham crackers and fold in.
Add your brownie mix into your baking pan and bake according to the package or until the toothpick comes out clean. OPTIONAL: take brownies out of the oven with 3-5 minutes left to bake and top with a little bit of mini marshmallows and graham crackers then place back in the oven to finish off
Fully cool, serve and enjoy!