330g brown butter, cool but fluid
500g sifted powdered sugar
300g ground almond flour
120g AP flour
1. Mix the almond flour and powdered sugar. Add the eggwhites and mix until even.
2. Add the salt, vanilla, and brown butter, mixing until even.
3. Fold the flour into the batter. Transfer to a parchment lined half sheet pan and bake at 325 5 turn 5 minutes.