"1¾ cups all-purpose flour 2 cups sugar ¾ cups good cocoa powder, such as Valrhona 2 teaspoons baking soda 1 teaspoon baking powder 1 teaspoon kosher salt 1…..."
INGREDIENTS
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6 ounces good semisweet chocolate, such as Valrhona (see note)
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½ pound (2 sticks) unsalted butter, at room temperature
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1 extra-large egg yolk, at room temperature
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1 teaspoon pure vanilla extract
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1¼ cups sifted confectioners’ sugar
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1 tablespoon instant coffee granules, such as Nescafe
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