INGREDIENTS
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3/4 cup cocoa powder
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2/3 cup sour cream
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2 2/3 cups cups all-purpose flour, plus more for pans
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2 teaspoons baking powder
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1 teaspoon baking soda
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1/2 teaspoon salt
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3/4 cup (1 1/2 sticks) unsalted butter, softened, plus more for pans
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1/2 cup vegetable shortening
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1 1/2 cups granulated sugar
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1 cup dark brown sugar
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3 large eggs
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1 tablespoon pure vanilla
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1/2 cup Caramel with Salt
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Whipped Caramel Ganache Icing
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Fleur de sel, for garnish