Sift together the cocoa powder, cake flour, salt, baking soda, and baking powder in a bowl.

In the bowl of a standing electric mixer, or by hand, beat together the butter and sugar about 5 minutes until smooth and creamy. You want it to look like soft almost fluffy butter icing, it will turn from a yellowish colour to almost completely white.

Add the eggs one at a time until fully incorporated. Scrape down the sides to be sure everything is getting mixed in.

Mix coffee and milk together.

For the next few steps if you're using a standing or electric mixer, mix them in by hand a bit first.

Stir half of the dry ingredients into the butter mixture.

Add the coffee and milk, stir to combine.

Finally stir in the other half of the dry ingredients.