Ingredients:
- 1 1/2 cup all purpose flour
 - 1 cup sugar
 - 1/2 tsp baking soda
 - 1/4 tsp table salt
 - 1/2 cup cocoa powder
 - 2 oz. square Bitter chocolate baking bar
 - 1 cup hot coffee
 - 2/3 cup mayonnaise
 - 1 large egg
 - 2 tsp vanilla extract
 
Directions:
- Adjust oven rack to middle position and preheat to 350 degrees F. Lightly spray 8-inch square baking dish with non-stick cooking spray.
 - Whisk flour, sugar, baking soda and salt together in a 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 just blended.
 - Scrape batter into prepared baking dish. Bake 30 to 35 minutes or until toothpick or wooden skewer inserted into center of cake comes out with a few crumbs attached to it.
 - Let cake cool in baking dish on wire rack, about 1 hour.
 - Dust with confectioners sugar, cut into squares, and serve straight from baking dish or turn cake out unto a serving platter and dust with confectioner sugar. This can also be served with whipped cream or vanilla ice cream.
 

