01 -
Preheat oven to 350°F. Line a 9×13 inch baking pan with parchment paper, leaving an overhang for easy removal.
02 -
Combine graham cracker crumbs, melted butter, and sugar. Press mixture firmly into the bottom of the prepared pan. Bake for 10 minutes.
03 -
Melt butter in a large saucepan over medium heat. Remove from heat, then whisk in granulated sugar until combined.
04 -
Beat in eggs one at a time, fully incorporating each before adding the next. Stir in vanilla extract until smooth.
05 -
In a separate bowl, whisk together cocoa powder, all-purpose flour, and salt. Gradually add this to the wet mixture, stirring until just combined.
06 -
Fold in 1 cup semisweet chocolate chips. Pour batter evenly over the pre-baked graham cracker crust.
07 -
Bake for 20 to 25 minutes, until a toothpick inserted in the center comes out with moist crumbs.
08 -
Remove brownies from oven. Immediately top with mini marshmallows, remaining chocolate chips, and broken graham cracker pieces. Return to oven for 5 to 7 minutes until marshmallows are golden and puffed.
09 -
Allow brownies to cool completely before lifting from pan and cutting into 16 squares.