Why Sponge Cakes Collapse in the Middle - A Bakery Chef Explains the Science

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Why sponge cake collapses in the middle during baking

Introduction to Sponge Cake Collapse Full Detail

The most painful moment in baking is when you open the oven door and your beloved sponge cake is slowly collapsing in the middle.This is a common problem for new and experienced bakers.

 

Personal Experience and Mistakes

I ruined a lot of cakes early in my baking career because I didn't know what was happens into the cake batter during baking, but once I understood the science of batter, my cake never collapsed again.
I am Bakery Chef Hassan with hands on experience in making delicate and airy sponge cakes.
In this article, I will explain to you why your cake shrink or collapse. I will tell you all the reactions that go on inside the cake batter, by understanding these causes so that you can avoid the same problems every time you make a cake again.

 

Importance of Learning Science Behind Baking

By the end of this article, you will know two things very well: one, how to prevent sponge cake from collapsing and the other, we will understand the science behind the cause of cake collapse, So we will be able to fix any cake.
Whether you're making a vanilla sponge cake or a chocolate cake, or you're trying out gluten-free baking products, there's a whole science behind perfect baking.
So let's dive into the world of science behind sponge cake.

The Science Behind Sponge Cake Collapse

Sponge cake depends largely on air incorporation, protein structure, and heat. When you whip eggs with sugar, you are trapping tiny air bubbles in the mixture. And these airy bubbles are the basis of a light and airy cake. During baking, the air bubbles in the cake batter expand due to the heat and the flour and egg proteins come together around it to form a structure.
But if something goes wrong, such as overmixing or underbaking, the protein network won't support it and the cake will sink in the middle.
Sponge cake contains eggs and eggs also contain water naturally, and in some recipes, we add some water ourselves to adjust the thickness of the mixture, but when this water evaporates quickly during Baking or Cooling, the cake then shrinks.

Baking Science Key Principles

Protein coagulation: During baking, the protein in the eggs and flour sets to support the structure.


Air Bubbles expansion: The heat also causes air bubbles to expand and the cake to rise.

Water Balance: Too much or too little water in cake batter affects the rise and shrinkage of the cake.

By understanding all these scientific principles, you can prevent your cake from collapsing or shrinking.

Remember all these principals and take pictures of actions where science works while baking and share them with me on Instagram @ProPastry.


Internal structure of sponge cake after baking

Application of Science in Real Life Baking

Let's see how science applies to real life baking.

Eggs Over-whipping: Over-whipping the eggs causes them to become too dry and hard, and the brittle structure collapses under its own weight.

Underbaking: If the center is not set, the cake will automatically sink in the center as it cools.

Oven Temperature Management: At too low temperature, the cake will not rise completely, and if the temperature is too high, the cake will bake on the outside but trap moisture inside.

For example, whenever you want to make a classic vanilla sponge cake, whisk the eggs until soft peaks form and preheat the oven. By following these principles, we can make a fluffy and airy cake every time.

Common Mistakes

Batter Over mixing: Overmixing causes gluten to develop more, making the cake dense and more likely to collapse.

Open the Oven too Early: Opening the oven door repeatedly causes temperature changes, which deflates air bubbles and causes the cake to sink.

Incorrect Leavening: Using too much or too little baking powder also affects the rise of the cake and is also the reason why the cake shrinks.

Keeping all these things in mind and understanding the science behind them can save us from many sponge cake disasters.

Some More Baking Related Information 

If you want to make a soft and fluffy vanilla sponge cake, check out my Vanilla Sponge cake recipe. For more baking information and tips read my guide on how to fix an under baked cake?

Author Bio

Baker Hassan - Certified Bakery Chef from Pakistan
Hi, my name is Hassan, I am a Certified Bakery Chef and I love making easy and delicious baking recipes.I have completed my Bakery Chef Diploma from the Vocational Training Institute.

FAQ Section

Q1: How do you keep a sponge cake from collapsing?

Make sure the eggs are well-beaten, avoid overmixing, bake at the right temperature, and open the oven door as little as possible. By following these tips, the cake can be protected from collapsing.

Q2: How do I know if I overmixed my cake batter?

Signs of overmixed batter include: It is too shiny. It is also too dense. And the batter has lost its air bubbles.

Q3: Why does cake shrink after baking?

The reason of the shrinkage of cake after baking is that most of the water in the cake has evaporated and the cake structure has not fully set and has sunk in the middle. Sometimes the reason for cake sinking is also the low temperature of the oven.

Conclusion

Sponge cake collapsing, sinking, and shrinking are always due to the physics and chemistry present in its batter. We can avoid problems that arise during cake baking by understanding air incorporation, protein coagulation, and moisture balance.By applying all these principals and avoiding common mistakes, we can make soft, fluffy, and airy sponge cakes every time.

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