Mix for about 10-12 minutes on high speed (be patient) until you get a fluffy and light mixture.
Sift the flour and baking powder into the whipped mixture and gently fold with a spatula until there are no streaks of flour visible.
Pour the cake batter into a parchment paper-lined 8-inch baking pan and bake in a 180c (350f) preheated oven for 25-30 minutes or until a toothpick inserted into the cake comes out clean.
If you can, bake the cake in 3 separate 8-inch cake pans for about 18 minutes.
Let the cake cool completely before frosting so the frosting won't melt off the cake. If you made the cake in one pan, cut it with a serrated knife into 3 even layers.
Notes
After you folded the flour into the mixture, fold it a couple more times to ensure that there are no streaks of flour in the mixture or at the bottom of the bowl.
If you are using an electric hand mixer and not a stand mixer, it will take you 2-4 minutes longer to whip the eggs.
Don't undermix the egg mixture! You will need to be patient and whip the eggs and sugar for at least 10 minutes until the mixture turns into a big cloud
When you add the flour, add it in 3 batches and sift the flour to prevent the mixture from deflating.
Use room temperature ingredients. It is important that you use room-temperature ingredients like eggs. This step ensures that your mixture mixes into a homogenous mixture and bakes perfectly. you don’t want to place cold batter into the oven.
Don’t overmix the batter, you don’t want to develop the gluten in the flour. This step ensures you have moist cake and not dense and dry cake.
Measure your flour correctly! When measuring your flour, avoid scooping it with a measuring cup. Instead, stir the flour with a spoon to create as many air pockets as possible, and spoon it into your measuring cup. Finally, level it with a back of a knife.
Use cake strips!Cake strips give you even and perfectly baked cake layers. Click here for the amazon link.
Scrape down the sides of the bowl frequently to ensure that you have a homogeneous mixture that has no cheese lumps.