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1
Preheat the oven to 350 and line an 8-inch-square baking pan with foil so it folds over the sides.
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2
In a food processor, finely grind the graham crackers (you should have 1 1/2 cups).
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3
Transfer the crumbs to a medium bowl.
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4
In a small saucepan, melt 5 tablespoons of the butter and stir the butter into the crumbs.
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5
Press the crumbs evenly into the bottom of the prepared pan and bake for about 12 minutes, until set; let cool completely on a rack.
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6
Meanwhile, in a medium microwave-safe bowl, combine 1 cup of the chocolate chips with the cocoa powder, 3 tablespoons of water and the remaining 5 tablespoons of butter.
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7
Microwave at high power for 1 minute, until almost melted, then whisk until smooth.
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8
Let cool to room temperature.
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9
In a small bowl, whisk the sugar with the flour, baking powder and salt.
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10
Whisk the eggs and vanilla into the cooled chocolate mixture.
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11
Stir in the flour mixture and the remaining 1/2 cup chocolate chips; stir to combine.
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12
Scrape the batter over the crust and spread evenly with an offset spatula.
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13
Bake for 35 to 40 minutes, until the brownies are set and a toothpick inserted in the center comes out almost clean.
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14
Preheat the broiler to low and set a rack 8 inches from the heat.
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15
Top the brownies with the marshmallows and broil until lightly browned, about 2 minutes.
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16
Let the brownies cool completely on a rack, then using the foil, lift the brownies out of the pan.
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17
Cut into squares and serve.
