Preheat the oven to 350 degrees. Grease two round cake pans with a bit of butter, then sprinkle with cocoa powder.
Sift the flour, cocoa, salt, and baking soda together in a large bowl.
Cream the sugar and butter together in your hand mixer or stand mixer until light and fluffy. Add the eggs one at a time, beating slowly, then the vanilla extract.
Combine the flour mixture alternatively with milk into the butter mixture, until thoroughly incorporated.
Pour the batter into the two prepared cake pans.
Bake for 20-25 minutes or until a tester inserted into the center of the cake comes out clean.
Allow to cool in the pan for 10 minutes before moving to a wire cooling rack to finish cooling.
Once the cake has completely cooled, frost and decorate. Enjoy.