These are, in a word, sublime. This is not a recipe to cut back on the quality of the ingredients; since you're going to be buying mascarpone cheese anyway (which isn't cheap), go for the gold and buy high-quality chocolate too. I like using the Lindt dark chocolate in this. Thanks to the Cookworks Show on Food Network Canada, where I saw this recipe being prepared and immediately knew it was a winner. After baking one batch, I knew I had gone to Brownie Heaven!