INGREDIENTS
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3 sticks unsalted butter, room temperature, plus more for pans
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1 cup unsweetened cocoa powder, plus more for pans
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1 cup boiling water
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1 cup sour cream
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3 cups all-purpose flour (spooned and leveled)
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3/4 teaspoon fine salt
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1 teaspoon baking powder
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1 teaspoon baking soda
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3 3/4 cups sugar, divided
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4 large eggs, plus 5 large egg whites, room temperature, divided
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5 teaspoons pure vanilla extract, divided
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1 tablespoon corn syrup
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