INGREDIENTS
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3/4 cup unsweetened Dutch-process cocoa powder
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3/4 cup hot water
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3 cups all-purpose flour
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1 teaspoon baking soda
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1 teaspoon baking powder
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1 1/4 teaspoons coarse salt
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1 1/2 cups (3 sticks) unsalted butter
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2 1/4 cups sugar
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4 large eggs, room temperature
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1 tablespoon plus 1 teaspoon pure vanilla extract
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1 cup sour cream, room temperature
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Chocolate Ganache Frosting
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Chocolate Curls, for decorating (optional)