Brownies--and desserts--are a lovely part of life. Actually these days--aside from making 'em--I use the dessert analogy a lot in my writing classes. I ask my students, "What's the job of a good dessert?" Usually they respond with something like, "to leave guests with a sweet taste in their mouths." Exactly. Now you may be wondering how I use that analogy in writing class. Well, I equate desserts with a good conclusion for an essay. As I tell them, the job of the conclusion is like that of a sweet at the end of a meal: you want to leave your "audience" with something to remember.
Back to the brownies, my first rule in baking is ask guests if they like--or can--eat nuts. Often I make two batches of brownies: one with nuts and one without.