- 6 tablespoons unsalted butter, melted
- 1 1/2 cups crushed graham cracker crumbs
- 2 tablespoons sugar
- Pinch fine salt
- 8 tablespoons (1 stick) unsalted butter
- 4 ounces unsweetened chocolate, chopped
- 1 cup packed light brown sugar
- 3/4 cup white sugar
- 1 1/2 teaspoons pure vanilla extract
- 1/2 teaspoon fine salt
- 4 large cold eggs
- 1 cup all-purpose flour
- 4 cups large marshmallows
Pre-heat oven to 325 degrees. Line an 8 by-8-inch square baking pan with foil so it hangs over the edges by about 1 inch.
For the crust: Lightly butter the foil with some of the melted butter. Stir the rest of the butter together with the crumbs, sugar, and salt in a medium bowl. Press the crumb mixture evenly over the bottom of the pan. Bake until golden brown, about 20 minutes.
Meanwhile, make the brownie batter. Add the butter and chocolate together in a microwave safe bowl. Use medium power setting to microwave for 2 minutes. Stir, and microwave again until completely melted, about 1-2 minutes more. Alternate method: put the butter and chocolate in a heatproof bowl. Bring a saucepan filled with 1 inch or so of water to a very slow simmer; set the bowl on the pan without touching the water. Stir occasionally until melted.
Once butter and chocolate are melted, stir the light brown and white sugars, vanilla and salt into the melted chocolate. Add the eggs and beat vigorously to make a thick and glossy batter. Add the flour and stir until just incorporated.
Pour batter into the prepared pan. Bake until the top is crispy and a toothpick inserted into the middle comes out mostly clean, with a few crumbs, about 40 to 45 minutes.
Remove from the oven and arrange marshmallows on top. Toast under broiler until golden - watch closely, this only takes 1-2 minutes. Cool on a rack, and then gently remove the brownies from the pan and foil lining. Cut into squares. Enjoy!