Ingredients
1 cup butter, softened
3 cups packed brown sugar
4 large eggs, room temperature
2 teaspoons vanilla extract
2-2/3 cups all-purpose flour
3/4 cup baking cocoa
3 teaspoons baking soda
1/2 teaspoon salt
1-1/3 cups sour cream
1-1/3 cups boiling water
FROSTING:
1/2 cup butter, cubed
3 ounces unsweetened chocolate, chopped
3 ounces semisweet chocolate, chopped
5 cups confectioners’ sugar
1 cup sour cream
2 teaspoons vanilla extract
Directions
