The most delicious cream cheese frosting! The richness of brown butter adds a nutty flavor and the combination of mascarpone and American cream cheese is perfect.
In a small light bottom skillet over medium heat, melt and cook the butter until lightly browned and with a nutty fragrance, about 5-8 minutes. Remove from heat and transfer to a heat safe container and refrigerate until solid.
Transfer butter to standalone mixer and beat until creamed. Add cream cheese, mascarpone cream cheese, vanilla paste and kosher salt and beat on low until well blended.
Add confectioner’s sugar, one cup at a time, and blend on low to avoid a powdered sugar cloud. Scrape the sides down after every cup of sugar. When all the sugar has been added, beat on medium-high speed for 2-3 minutes.