First thing you want to do is bake your brownies following the instructions on the box, or make them from scratch. Be sure to add about a cup of chocolate chips to the batter before you put them in the oven.
Take the brownies out of the oven and set aside. Set your oven to Broil.
After they are done, immediately sprinkle the top with crushed up graham crackers, then top with the marshmallows. Place them back into the oven for just a minute or so. You want to watch the marshallows carefully as they burn easily. Take them out as soon as you notice the marshmallows turn a golden brown color on top.
Remove the brownies from the oven and sprinkle the top with the remaining chocolate chips (About a cup).
*Store at Room Temperature in an air tight container.