The 3 Secrets to a Perfect Sponge Cake

A good sponge cake should bake up tall, light, and airy, while keeping its shape after it comes out of the oven. Even though the ingredient list is short and simple, the final result depends greatly on technique. A few small details can make the difference between a beautiful, fluffy sponge and one that collapses the moment it cools.

Here are the three most important secrets for a sponge cake that rises well, stays high, and doesn’t sink.

Secret 1: Don’t open the oven too soon

The first stage of baking is crucial. If you open the oven door during the first 20 minutes, the sudden drop in temperature can cause the sponge to deflate. No matter how tempting it is to check, let it bake undisturbed during this time.

Secret 2: Don’t grease the sides of the pan

For the batter to rise properly, it needs to grip the sides of the pan as it bakes. If the sides are coated with butter or oil, the batter may slip downward instead of climbing upward, which can lead to a flatter sponge. The best method is to line the pan only with baking paper. If you’re using a cake tin, line just the base and leave the sides ungreased.

Secret 3: Skip the baking powder

Traditional sponge cake doesn’t need chemical leavening. Its volume comes from the air beaten into the egg whites. Adding baking powder can interfere with the structure and make the texture less stable. A classic sponge relies on properly whipped eggs for lift.

Ingredients

6 eggs
6 tablespoons sugar
6 tablespoons white flour
6 tablespoons water
1 pinch of salt

Method

1. Whip the egg whites

Beat the egg whites with a pinch of salt until they become foamy and start forming stiff peaks. Once they are nearly ready, slowly add half of the sugar and continue beating until the mixture is glossy and firm enough that the whisk leaves clear traces.

2. Mix the yolks

In a separate bowl, beat the egg yolks with the remaining sugar until the mixture becomes pale and creamy.

3. Fold everything together

Gently fold the yolk mixture into the whipped egg whites, using slow movements from the bottom upward so you don’t lose the air. Add three tablespoons of flour and three tablespoons of water, mixing carefully. Then add the remaining flour and water in the same gentle way until the batter is smooth and airy.

4. Bake

Pour the batter into the prepared pan and level it lightly. Bake in a preheated oven at 160°C for about 20–25 minutes. After 20 minutes, test the sponge with a toothpick. If it comes out clean, it is done.

Final result

You’ll get a sponge cake that is tall, soft, and stable—ideal for layered cakes, filled desserts, or simple homemade treats. When you follow these three basic rules, the sponge keeps its height and stays beautifully fluffy.