INGREDIENTS
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3 1/2 cups all-purpose flour
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1 large egg
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1/4 teaspoon salt
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1 teaspoon pure vanilla extract
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1 1/4 teaspoons baking powder
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1/2 cup buttermilk, shaken
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1 1/4 teaspoons baking soda
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5 large egg whites (for filling)
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3/4 cup dark unsweetened cocoa powder (like Valrhona)
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1 1/2 cups sugar (for filling)
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2 teaspoons instant espresso powder
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2 cups (4 sticks) unsalted butter, cut into 1/2-inch cubes, cool but not cold (for filling)
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1/2 cup hot coffee
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1/4 teaspoon salt (for filling)
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2 cups firmly packed light brown sugar
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1 teaspoon pure vanilla extract (for filling)
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3/4 cup canola oil
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