INGREDIENTS
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3/4 cups all-purpose flour
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3/4 cups white granulated sugar
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1/3 cup dutch cocoa powder
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1 teaspoon instant espresso powder
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3/4 teaspoon baking soda
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1/2 teaspoon baking powder
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1/2 teaspoon salt
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1 large egg
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1/3 cup, plus 1 tablespoon, buttermilk
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1/3 cup, plus 1 tablespoon, warm water
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1 1/2 teaspoon olive oil
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1 teaspoon vanilla extract
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3/4 cup unsalted butter, at room temperature
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2 cups powdered sugar, sifted
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3 ounces dark chocolate or semi-sweet chocolate, melted and cooled
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1 1/2 tablespoons cream or milk
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3/4 teaspoon vanilla extract
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Flaked sea salt, for topping