INGREDIENTS
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or the cake:
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4 ounces unsweetened chocolate, chopped
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1/4 cup Dutch-processed cocoa
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1 1/4 cups boiling water
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3/4 cup unbleached all-purpose flour
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3/4 coup plain cake flour
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1 tsp baking soda
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1/4 tsp salt
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2 sticks unsalted butter, softened but still cool
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1 1/2 cups packed dark brown sugar
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3 large eggs, at room temperature
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1/2 cup sour cream
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1 tsp vanilla extract
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For the filling:
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2 sticks unsalted butter, at room temperature
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1/2 cup light brown sugar, packed
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2 1/3 cups confectioners’ sugar
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2/3 cup all-purpose flour
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1/2 tsp salt
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2 tbsp milk
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2 tsp vanilla extract
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1/4 cup mini semi sweet chocolate chips
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For the frosting:
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5 sticks unsalted butter, softened
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5 cups Confectioners’ sugar
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1/4 tsp salt
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4 tsp vanilla extract
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1/4 cup heavy cream
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