Adjust oven rack to middle position and heat oven to 350 degrees. Lightly spray 8 square baking dish with nonstick cooking spray.
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 mayo, egg, and vanilla. Stir mayonnaise mixture into flour mixture until combined.
Scrape batter into prepared pan and smooth top. Bake until wooden skewer inserted into center of cake comes out clean with few crumbs attached, 30-35 minutes.
Let cake cool in pan on wire rack, 1-2 hours. Dust with confectioners sugar, cut into squares, and serve straight from pan, or turn cake out onto serving paltter and dust with confectioners' sugar.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	420.75 Kcal (1762 kJ)
Calories from fat	195.58 Kcal
		% Daily Value*
Total Fat	21.73g	33%
Cholesterol	42.92mg	14%
Sodium	379.34mg	16%
Potassium	253.48mg	5%
Total Carbs	53.71g	18%
Sugars	24.57g	98%
Dietary Fiber	3.28g	13%
Protein	6.03g	12%
Iron	3mg	17%
Calcium	26.9mg	3%

Amount Per 100 g
Calories	295.68 Kcal (1238 kJ)
Calories from fat	137.44 Kcal
		% Daily Value*
Total Fat	15.27g	33%
Cholesterol	30.16mg	14%
Sodium	266.57mg	16%
Potassium	178.13mg	5%
Total Carbs	37.74g	18%
Sugars	17.27g	98%
Dietary Fiber	2.3g	13%
Protein	4.24g	12%
Iron	2.1mg	17%
Calcium	18.9mg	3%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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