This salted caramel layer cake is a showstopper. The cake layers are moist and fluffy, and the salted caramel frosting is rich and decadent. The cake is made with a combination of all-purpose flour and almond flour, which gives it a nutty flavor and a tender crumb. The frosting is made with caramel sauce, cream cheese, and butter, and is finished with a sprinkle of sea salt.