This recipe makes dense, fudgey brownies. If you prefer them a little more cakey in texture, add an extra quarter teaspoon of baking powder and bake for 5-10 minutes more.
As always, the better quality ingredients you use, the better the outcome, so please go for real butter and decent quality chocolate if you can. However, cheap supermarket chocolate and baking blocks such as Stork still give a thoroughly decent brownie.