Preheat oven to 180°C / 350°F degrees. Coat 2 large baking sheets with oil spray, line each with parchment, then spray parchment.
Combine cake flour, almond flour, and salt in a medium bowl. Set aside
Add eggs, yolks, and granulated sugar in a mixer bowl set over a pot of simmering water.
Whisk until sugar dissolves and mixture is warm to the touch, about 2 minutes. Add the whisk attachment to your stand mixer, and whisk mixture on medium speed for 2 minutes. Please note: You may need to do this in two goes. It’s quite a lot of mixture and some stand mixers won’t be able to whisk it all at once. So do it in two goes.
Raise speed to high, and whisk until mixture is pale and thick. About 4 - 5 minutes.
Sift flour mixture over egg mixture, and gently fold. When almost incorporated, slowly add melted butter, and fold.
Pour the batter into the baking sheets, spread evenly, and bake until golden brown and springy to the touch. About 8 -10 minutes. Once they’re baked, allow them to cool completely. Let cool.
Use a 7” cake ring, cut out 4 circles.Choose the 2 thickest cake circles, reserve the other two for another cake if you wish. This cake can be quite crumbly so it’s best to have more cake and have extras in case you need them.