A chiffon cake can look successful in the oven and still deflate after cooling. That usually means the structure was not strong enough to hold the height it gained.
Start by separating normal settling from real collapse. A small height change can be normal, but folded sides, a sunken top, or a heavy crumb need troubleshooting.
Quick diagnosis
- Deflates while cooling upside down: Check bake time and meringue strength.
- Deflates after unmolding: Check whether the cake cooled fully and released cleanly.
- Deflates with a wet crumb: Check underbaking and excess moisture.
Likely causes
The most common causes are underbaking, weak meringue, too much moisture, and unmolding before the cake is completely cool.
A tube pan helps the cake hold onto the sides while cooling. If the pan surface is too slippery or the cake is removed early, the structure loses support.
Quick test
Bake a few minutes longer and cool the cake fully upside down in the pan. If the cake holds better, the issue was likely bake time or cooling support.
Next-bake fixes
- Make meringue stable and glossy.
- Bake until the center springs back and the cake feels set.
- Invert the pan immediately after baking.
- Wait until the pan is completely cool before unmolding.
