Preheat the oven to 350ºF (180ºC). Grease a 9×5-inch (23×13-cm) loaf pan.
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In a large bowl, beat the butter until smooth and light. Gradually beat in the flour, ginger, and molasses. Beat until smooth.
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In a separate bowl, whisk together the egg yolks and the salt. Gradually whisk in the powdered sugar.
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In the bowl of a stand mixer fitted with a whisk attachment, or in a large bowl with which an electric hand mixer is to be used, beat the reserved egg whites to stiff peaks. Beat in the baking powder.
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Mix the egg yolk mixture into the creamed mixture, before adding the egg white mixture. Beat thoroughly.
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Turn into the prepared pan and bake for 50 to 55 minutes, or until a toothpick inserted into the center can be removed cleanly.
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Cool in the pan for 10 minutes before transferring to a wire rack to cool completely before slicing.