"A classic chocolate layer cake with a new-fashioned, thick, and rich frosting. This treat can be made up to two days ahead...."
INGREDIENTS
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Nonstick vegetable oil spray
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2 cups sifted cake flour (sifted, then measured)
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1 cup unsweetened cocoa powder (preferably Dutch-process)
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1 1/4 teaspoons baking soda
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3/4 teaspoon salt
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1/2 teaspoon baking powder
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1 1/2 cups (packed) golden brown sugar
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1 cup plus 2 tablespoons (2 1/2 sticks) unsalted butter, room temperature
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3 large eggs
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1 tablespoon vanilla extract
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1 cup plus 2 tablespoons buttermilk
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1/2 cup lukewarm water
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1 cup semisweet chocolate chips
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24 ounces imported milk chocolate (such as Lindt), finely chopped
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3 ounces bittersweet (not unsweetened) or semisweet chocolate, finely chopped
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1 1/2 cups sugar
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1/2 cup water
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2 1/4 cups whipping cream