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Preheat the oven to 350°F. Lightly grease a loaf pan: either 9" x 5", or 8 1/2" x 4 1/2". The smaller pan will yield a higher-crowned loaf.
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In a medium-sized mixing bowl, beat together the butter, sugar, salt, vanilla, baking powder, espresso powder, cocoa, and Cake Enhancer to make a sandy, somewhat clumpy mixture. Don't worry; the eggs will smooth things out.
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Add the eggs one at a time, beating well after each addition. Scrape down the sides and bottom of the bowl midway through this process.
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Add half the flour to the bowl, beating at low speed to combine.
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Add all of the milk, beating at low speed to combine.
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Add the remaining flour, beating gently just until the batter is smooth.
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Pour the batter into the prepared pan.
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Bake the cake for 60 to 70 minutes, or until a toothpick inserted into the center comes out clean. The top may look a tiny bit damp; that's OK. If you have an instant-read thermometer, the center will register about 205°F, while just under the top will register about 195°F.
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Remove the cake from the oven, loosen the edges, wait 10 minutes, and turn it out of the pan onto a rack to cool.
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Store completely cooled cake well wrapped, at room temperature.