You can find the Mac and Cheese recipe here. Just add the desired amount of blue cheese. I made a half recipe and added two ounces of Saint Agur Blue Cheese to the sauce and another two ounces (or so) of blue cheese crumbled on top of each portion.
You can find the brownie recipe here. Follow the instructions for the brownies but only pour in half of the batter. Place a single layer of peppermint candies on top of the batter (about 16 or so See's pieces but probably less York Patties). Then pour over the rest of the batter and bake as instructed.