To make, grease each ramekin by spreading a thin layer of softened butter in each ramekin. Then add in some cocoa powder, twirl and tap it around so it coats the sides and bottoms and then gently tap out any excess cocoa powder.
In a stand mixer fitted with the whisk attachment, beat the eggs, egg yolks, sugar, vanilla, and salt at high speed until light and fluffy, about 3-4 minutes.