A sponge cake that rises like crazy – without baking powder! 
You don’t need baking powder to have a sponge cake fluffy like a puff. All you need is a good egg whipping technique and gentle mixing of ingredients. 
Ingredients:
4 large eggs (room temperature)
1 cup sugar
1 cup plain flour
1/4 teaspoon salt
1 teaspoon vanilla extract (optional)
Step-by-step preparation:
Beat the egg whites with a pinch of salt into hard snow. 
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In a separate bowl, beat the egg yolks with the sugar until light and fluffy. Gently mix the egg yolks with the egg whites and add the sifted flour – mix slowly from the bottom up. Pour the mixture into a parchment paper-lined mold and tap lightly to remove any bubbles . Bake at 175-180°C for approximately 25 minutes. After baking, leave the cake in the tin for 10 minutes, then let it cool on a wire rack. Tips: Add lemon or orange zest to taste. For the chocolate version, you can add a tablespoon of cocoa powder. During baking oven
Do not open! To maintain the stability of the foam, add a few drops of lemon juice. 
