I gave up drinking diet coke at the start of June and genuinely haven't missed the stuff but when I tried to stop eating chocolate at the same time then that was a whole different kettle of fish! In an attempt to get temptations out of the house, I made these brownies with all of my chocolate and sold them for charity (Cleft Palate). The results were extremely more-ish and went down well with all who tried them.
You don't have to use Boost bites, instead you could pick any of the sharing bags of mini chocolates. Maltesers . . . twirls . . . even chocolate buttons. I had a mix of twirls and boosts in my cupboard, which gave a lovely richness and texture to the finished brownies.