Baking teacher Alice Medrich, author of Sinfully Easy Delicious Desserts
and several other cookbooks, stirs nutty brown butter into chocolate-walnut brownies; it adds a deeper flavor than plain butter. The batter is thick enough to spread with deep swirls, resulting in soft, velvety bites with slightly crusty tops. Although Medrich says there isn't a one-size-fits-all test for doneness (since some brownies are cakey, while others are chewy), she always uses a wooden toothpick or skewer because batter and crumbs tend not to stick to metal cake testers.
Get the recipe: Cocoa Brownies with Walnuts and Brown Butter