Cake flour and baking powder should be thoroughly combined. Place aside.

Cream of tartar and egg whites should be combined, then the mixture should be beaten until it is reasonably frothy.

Add sugar gradually, then whisk the mixture until it has a fluffier texture. This process, which should take 4 to 8 minutes, should be done at fast speed.

Mix again after adding egg yolks and lemon juice.

Vegetable oil is added, mixed for a short while, and then the cake flour and baking powder mixture is gradually added. Mixing should continue until the texture is smooth.

350 degrees Fahrenheit should be the oven's setting.

Cooking spray should be used to coat the moulds before adding portion of the mixture. This practise should be repeated until the entire combination has been consumed.

Bake for 13 to 16 minutes, or until a toothpick comes out clean.

Take out of the oven, then allow to cool.

Serve. Enjoy and share!