- Mix butter, and sugar together until light in color.  
- Add in vanilla extract. 
- Add in the eggs, one at a time, mixing until just blended in between each egg. 
- Add cocoa powder, flour, baking powder, and salt.  
- Stir until well blended. Scrape the sides with a rubber spatula to make sure everything is integrated.  
- Bale for 30-35 minutes until an inserted toothpick comes out mostly clean.  
- Allow to cool for 2 hours before adding frosting on top (or place in the fridge for about 45 minutes)