Why Did My Cake Sink in the Middle? 6 Causes and Fixes
A cake that collapses in the centre usually has one of six causes: opening the oven too soon, underbaking, too much leavening and more. How to fix each.
By the Forkful editorial team · Published
Quick answer
A cake sinks when its structure has not set before the air bubbles inside it collapse. The most common reasons are opening the oven door too early, taking the cake out underbaked, using too much baking powder or an oven that is cooler than its dial says.
1. You opened the oven too early
In the first two thirds of the baking time the batter is still liquid in the middle. A rush of cold air can make the rising bubbles shrink, and the cake falls before the crumb has set. Keep the door shut until the last third and, if you must check, do it quickly.
2. The cake was underbaked
A cake that looks golden outside can still be raw in the centre, and a raw centre cannot hold its shape as it cools. Push a wooden skewer into the middle: it should come out clean or with a few dry crumbs, never with wet batter. The top should also spring back when pressed lightly.
3. Too much baking powder or baking soda
It sounds odd, but more leavening does not mean a taller cake. Too much makes the batter rise fast and big, then collapse because the crumb cannot support it. Use level measuring spoons, not heaped ones, and never swap baking powder and baking soda one for one.
4. The oven is cooler than it says
Many home ovens are off by 15–25 °C. If the oven is too cool the cake rises slowly and the centre stays soft for longer. An inexpensive oven thermometer tells you the real temperature, and you can adjust the dial to match.
5. Too much sugar, fat or liquid
Sugar, butter, oil and milk make a cake tender, but in excess they weaken the structure that the flour and eggs build. If you change a recipe, change one thing at a time and keep the proportions close to the original.
6. The batter waited too long
Baking powder starts working as soon as it meets liquid. If the batter sits for 30 minutes before it goes in the oven, much of the lift is gone. Preheat the oven first and bake straight away.
A quick checklist
Preheat fully, measure leavening level, keep the oven closed for most of the bake, test with a skewer and let the cake cool in the tin for 10 minutes before turning it out. If the middle still dips a little, the cake is perfectly safe to eat: it is a texture problem, not a food-safety one.
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Frequently asked questions
Can I save a cake that has sunk?
Yes. Cut away the dense centre or fill the dip with cream, fruit or icing. If the centre is raw, return it to the oven covered loosely with foil.
Does opening the oven always make a cake sink?
No, but doing it early in the bake is the most common cause. After the cake has set, usually in the last third of the time, a quick check is fine.
How do I know when a cake is done?
A skewer in the centre comes out clean or with dry crumbs, the edges pull slightly from the tin and the top springs back when pressed lightly.