S'mores Brownies
Ingredients
- Nonstick cooking spray
- 10 graham crackers (3 1/2 ounces; 100 g)
- 168 g unsalted butter (about 6 ounces; 12 tablespoons), divided
- 115 g granulated sugar (about 2 1/3 ounces; 1/2 cup plus 1 tablespoon)
- 1/2 teaspoon Diamond Crystal kosher salt; for table salt, use half as much by volume, divided
- 170 g bittersweet chocolate (6 ounces; 1 cup)
- 2 large eggs
- 1 teaspoon instant espresso powder
- 1 1/2 teaspoons vanilla extract
- 32 g all-purpose flour (about 1 ounce; 1/4 cup)
- 3/4 teaspoons baking powder
- 129 g mini marshmallows (4 1/2 ounces; 3 cups)
Instructions
- 1
Adjust oven rack to middle position and preheat oven to 350°F (180°C). Line an 8- by 8-inch baking pan with two 8-inch-wide strips of foil so that all sides are covered with about 3 inches of overhang on all sides. Using nonstick cooking spray, grease foil.
- 2
Break graham crackers into small pieces and, using a food processor, pulse until finely ground. (You should have about 1 cup of crumbs.) In a small microwave-safe bowl, microwave 4 tablespoons butter on medium power, stirring occasionally, until melted, about 1 minute. Add melted butter, 1 tablespoon (15 g) sugar, and 1/4 teaspoon salt to crumbs and pulse to combine. Using a flexible spatula, scrape crumbs onto bottom of prepared pan. Spread into an even layer, then use a flat-bottomed drinking glass or measuring cup to compress firmly until crumbs are in a compact, even layer across bottom and sides of pan.
- 3
In a large microwave-safe bowl, combine chocolate and remaining 8 tablespoons (4 ounces; 113 g) butter; microwave on high, stirring every 30 seconds, until melted and smooth, about 2 minutes.
- 4
Whisk in remaining 1/2 cup (100 g; 3 1/2 ounces) sugar, eggs, espresso powder, vanilla, and remaining 1/4 teaspoon salt. Add flour and baking powder, and whisk until smooth.
- 5
Pour batter into prepared pan. Bake until a toothpick or cake tester inserted into the center of the brownies comes out with moist crumbs attached, 25 to 30 minutes. Transfer to a wire rack and top with marshmallows.
- 6
Using gloved hands or kitchen towels, carefully adjust oven rack to upper third position and heat broiler. Return brownies to oven and broil until marshmallows are golden brown, about 1 minute.
- 7
Transfer to a wire rack and let cool in pan until room temperature, about 1 hour.
- 8
Using a chef's knife lightly greased with cooking spray, slice and serve brownies.




