Preheat the oven to 180°C.
In a large bowl, mix together the flour, sugar, melted butter, eggs, milk, Kahlua, cocoa powder, baking powder, and salt until you obtain a smooth batter.
Pour the batter into a greased and floured cake pan.
Bake for approximately 40 to 45 minutes, or until a toothpick inserted into the center of the cake comes out clean.
Allow it to cool before removing it from the pan.
