Ingredients

• 1 1/2cups unbleached all-purpose flour (7 1/2 ounces)
• 1cup sugar (7 ounces)
• 1/2teaspoon baking soda
• 1/4teaspoon table salt
• 1/2cup Dutch-processed cocoa powder (2 ounces)
• 2ounces bittersweet chocolate, chopped fine (see note)
• 1cup fresh black coffee, hot
• 2/3cup mayonnaise
• 1large egg
• 2teaspoons vanilla extract
• Confectioners' sugar (for serving; optional)

Directions

1. Adjust oven rack to middle position and heat oven to 350 degrees. Lightly spray 8-inch-square baking dish with nonstick cooking spray.

2. Whisk flour, sugar, baking soda, and salt together in large bowl. In separate bowl, combine cocoa and chocolate; pour hot coffee over cocoa mixture and whisk until smooth; let cool slightly. Whisk in mayonnaise, egg, and vanilla. Stir mayonnaise mixture into flour mixture until combined.

3. Scrape batter into prepared pan and smooth top. Bake until wooden skewer inserted into center of cake comes out with few crumbs attached, 30 to 35 minutes.

4. Let cake cool in pan on wire rack, 1 to 2 hours. Dust with confectioners’ sugar, cut into squares, and serve straight from the pan; or turn cake out onto serving platter and dust with confectioners’ sugar.

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