Preheat the oven to 325 degrees F. Generously spray a 10-inch Bundt pan with cooking spray.
Combine the flour, sugar, baking powder, baking soda, cardamom, and salt in a medium bowl. Combine the cocoa and espresso powder in a small bowl. Pour the boiling water over the cocoa mixture, whisking until smooth. Stir in the vanilla.
Whisk together the yogurt, milk, oil, egg, and egg white in a large bowl; stir in the cocoa mixture until blended. Gradually add the flour mixture, stirring just until combined. Stir in the currants and chopped chocolate.
Pour the batter into the pan. Bake in the center of the oven until a cake tester inserted in the cake comes out clean, about 50 minutes. Cool on a baking rack for 10 minutes, then turn the cake out onto a baking rack to cool completely. Dust generously with confectioners' sugar just before serving.
This recipe has been updated and may differ from what was originally published or broadcast.
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