Fix brownie mix as suggested on box. Before putting the mix in the pan. put a layer of graham cracker crumbs down. Then put the brownie mix in on top of the graham cracker. Bake the brownies at the time and temperature on the box, but pull out the brownies about 2-3 minutes before they are done. Where the toothpick does not completely come out clean. Put the mini marshmallows across the top of the pan until it is covered with a layer. Then pop them back into the oven for about 4-7 minutes or until the marshmallows have melted a little and turned brown. Then sprinkle the mini chocolate chips on top. Garnish the top with a drizzle of chocolate syrup, and any left over graham cracker crumbs.