Brownies + Peanut butter = Bliss
Boxed brownie mix, prepared as directed.
Chopped up Reeses and Reeses Pieces mixed in the batter.
Bake brownies as directed, except 10 minutes before they're done add some pieces to the top.
Very simple, but really good if you're in a rush, and super easy to do last minute.
Everyone will love them, and hey, you don't have to say they're from a box.