INGREDIENTS
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Makes 32 cookies
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1 tablespoon instant espresso powder
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1 tablespoon boiling water2 cups all-purpose flour
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4 ounces bittersweet chocolate, finely chopped, or ¾ cup store-bought mini chocolate chips
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2 sticks (8 ounces) unsalted butter, at room temperature
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2/3 cup confectioners' sugar
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1/2 teaspoon pure vanilla extract
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Confectioners' sugar, for dusting (optional)