I attempted to make genoise, the Italian sponge cake, back in the late 1990s. After several turns, I gave up. A few days ago, I decided to try again. The end result was better, but I still had tiny balls of flour in the mix. Any suggestions? Here's what I did - I used half cake flour and half all-purpose flour, mixing the flours with salt and 2 tablespoons of the sugar; heated all of the eggs and the sugar to 90 degrees Fahrenheit over hot water then beat on high for 2 minutes followed by 12 minutes at medium speed of a stand mixer; sifted the flour and sugar mixture over the batter then gently folded the flour in; it took five intervals of folding; folded the vanilla extract and a bit of heavy cream with 1 cup of the batter then added the new mixture to the batter. I used a sheet pan. Well, the batter did deflate some and I still ended up with balls of flour. It tasted great though was less than an inch (less than 2.54 cm) thick. What is the secret to folding in flour without getting bits of it in the baked product? I have made a similar recipe using room temperature eggs and adding the flour while the mixer was turned on. No flour balls, but the baked cake does shrink quite a bit; I used a sheet pan and cupcake pans. Thanks for your help!