A sunken center means the cake rose but could not hold its structure. The cause is usually underbaking, weak foam, or cooling before the crumb has fully set.
Look at when the sinking happened. A center that falls in the oven points to heat and structure; a center that falls during cooling points to bake time or upside-down cooling.
Quick diagnosis
If the middle is wet or gummy, it was probably underbaked. If the crumb is soft but the shape folded inward, the meringue or cooling step may have failed.
- Wet center: Check bake time and real oven temperature.
- Folded center after cooling: Check upside-down cooling and meringue strength.
- Tall sides with low center: Check heat balance and pan fill level.
Likely causes
Middle sinking often comes from a center that was still flexible when the cake was removed from heat.
- Underbaking: The outside looks done before the center sets.
- Foam instability: Large bubbles collapse as steam escapes.
- Cooling too early: The cake needs full inverted cooling to hold height.
Quick test
Bake until the top springs back and a skewer comes out without wet batter, then cool the pan fully upside down. If the center stays level, the old bake was too short or cooled too soon.
Next-bake fixes
Focus on setting the center without drying the outside.
- Extend baking by a few minutes before changing the recipe.
- Use a lower rack if the top browns too quickly.
- Avoid very large bubbles in the final batter.
- Invert the pan immediately after removing it from the oven.
Related troubleshooting
Use these related guides if the same cake also shows another visible symptom.
