Adapted from
Baked: New Frontiers in Baking by Matt Lewis & Renato Poliafito
Crush the Altoids in a sturdy freezer bag with a mallet or rolling pin, or in a
mortar and pestle. They should be relatively fine, but I do like having little bits remaining. They make a few varieties, but I’ve only used the peppermint ones, although the others will likely be just as good. If you want your brownies even more minty, add the larger amount of mints. You can add some pure mint extract to the batter, too.