Preheat the oven to 325℉ and line a 9 x 5-inch loaf pan with parchment paper.
In a glass bowl, combine the butter, sugar and cocoa powder.
Microwave for 30 seconds on full power. Stir, and microwave for another 30 seconds on full power.
Beat the mixture very well, and then add the salt and vanilla extract. Stir well and allow the mixture to cool for a few minutes.
Next, add the egg, and stir until the egg is well incorporated.
Finally, add the flour and baking powder and stir until the flour is combined with no visible streaks. Stir in the chocolate chips and/or nuts.
Using a small spatula, spread the batter into the prepared pan.
Back 22-25 minutes until a toothpick inserted comes out with fudge crumbs clinging to it. The brownies are done when shiny and the surface is starting to crack.
Let cool completely in the pan, and then lift out using the parchment paper.