In a large bowl, whisk together the flour, sugar, cocoa powder, and baking powder.
Melt the butter, then stir in the milk. Add the espresso coffee and rum.
Separate the eggs. Whisk the yolks into the butter mixture, then pour into the dry ingredients and mix until smooth.
In a separate clean bowl, whisk the egg whites until stiff peaks form. Gently fold the egg whites into the batter until just combined, ensuring it remains light and airy.
Pour the batter into a greased and floured cake pan. Bake in a preheated oven at 350°F (180°C) for 35-40 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake cool completely. Dust with powdered sugar and decorate with whipped cream or chocolate shavings.
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