INGREDIENTS
1 1/2 sticks
unsalted butter, softened
1 3/4 cups
packed light brown sugar
2 tsp
pure vanilla extract
3
eggs, at room temperature
1 3/4 cups
all-purpose flour
3/4 cup
Dutch-process dark cocoa powder
1 1/2 tsp
baking powder
1 tsp
salt
1 1/3 cups
buttermilk, room temperature
1/4 cup
mayonnaise
1 tsp
baking soda
2 tsp
white vinegar
1 1/2 cups
unsalted butter, softened
1/2 cup
confectioners' sugar, sifted
1/2 cup
dark cocoa powder, sifted
1/3 cup
hot water
1/4 cup
sour cream
1 tsp
pure vanilla extract
1/8 tsp
salt
10 oz
milk chocolate, chopped, melted and cooled slightly
5 oz
dark chocolate, chopped, melted and cooled slightly
Sprinkle medley, for decorating (see Sweetapolita's Notes)