Baking with brown butter is slightly more complicated than simply mixing the ingredients together to form batter — but the results are worth it. These cupcakes contain brown butter, cake flour, baking powder, baking soda, salt, egg whites, sugar, vanilla extract and whole milk. The cream cheese frosting is made from lucuna powder (lucuna is a maple-like sweetener that is native to South America), cream cheese and more unsalted butter. Definitely different, definitely tasty.
Source Cupcake Project