Some people like their brownies fudge-y whilst others like it more cake-y.
Lets just say this recipe is something in between and it can be altered to your liking by making slight changes. If you like it cake-y add one more egg to it. Adding baking powder gives it that crust formation on the top.
I like chopped roasted walnuts added to my brownies but you can either omit it entirely or replace it with choco chips or any other type of nut.
