INGREDIENTS
3/4 cup
all-purpose flour
3/4 cup
white sugar
1/4 cup
dark cocoa powder (I use Cacao Barry Extra Brute)
3/4 tsp
baking soda
3/4 tsp
baking powder
3/4 tsp
cornstarch
1/2 tsp
salt
1/3 cup
buttermilk
1/4 cup
brewed coffee or espresso, hot
3 tbsp
vegetable oil
1
egg, room temperature, lightly beaten
1 1/2 tsp
pure vanilla extract
1 cup
(227 g)(2 sticks) unsalted butter, softened but cool
1 1/2 cups
icing sugar (confectioners’), sifted
2 tsp
pure vanilla extract
3/4 cup
premium bittersweet chocolate, chopped, melted and slightly cooled
1/3 cup
Nutella
1 tbsp
milk
salt