Make a sabayon with eggs and sugar.
Make a medium-peak meringue with egg white, sugar, and egg white powder.
Fold half of the meringue into the sabayon, followed by all the dry ingredients.
Fold in the remaining half of the meringue.
Emulsify the butter into the batter.
Spread on the Flexipan and bake at 180°C for 12 minutes.