In a stand mixer, beat together for 15 minutes on high speed (or a little lower if using a higher-speed handheld mixer) :
5 eggs (large, whole eggs - not super yolky / not farmraised)
1 cup sugar (add gradually as eggs are being beaten)
pinch of salt
Then fold in, carefully,
1/2 teaspoon vanilla
1 cup flour
Line 2 cake pans with parchment (or waxed) paper...*do not grease pans*
Spoon batter equally into pans
Bake 18-20 minutes at about 350 degrees.