INGREDIENTS
4 oz
unsweetened chocolate, chopped
1/4 cup
Dutch-processed cocoa
1 1/4 cups
boiling water
3/4 cup
all-purpose flour
3/4 cup
cake flour
1 tsp
baking soda
1/4 tsp
salt
2 sticks
butter
1 1/2 cups
dark brown sugar
3
eggs
1/2 cup
sour cream
1 tsp
vanilla extract