Why did my cake sink in the middle?

Updated October 2026 · How we answer

Common Causes

The most frequent culprit is underbaking: the center didn't set before the structure collapsed. Oven thermostats can be inaccurate by 25°F or more, so an oven thermometer helps. Another cause is expired baking powder or soda—they lose potency after about 6–12 months.

Overmixing after adding flour develops too much gluten, making the cake rise then fall. Opening the oven door during baking lets in cool air, causing a sudden drop in temperature that can make the cake sink.

• Check expiration dates on leavening agents.
• Use an oven thermometer to verify temperature.
• Mix until just combined after adding dry ingredients.
• Avoid opening the oven until the last few minutes of baking.

Fixes and Prevention

If your cake sinks, you can often salvage it by cutting off the sunken part and using the rest for trifle or cake pops. To prevent it next time, test for doneness with a toothpick inserted in the center—it should come out with a few moist crumbs, not wet batter.

Also, make sure ingredients are at room temperature unless the recipe says otherwise. Cold eggs or butter can cause uneven mixing and baking. Reduce oven temperature by 25°F if your cakes consistently dome and crack.

• Use a toothpick or cake tester to check doneness.
• Let the cake cool in the pan for 10 minutes before removing.
• If your oven runs hot, lower the temperature slightly.

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