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A cake rises while its air cells expand, then needs enough structure to support that height as it cools. A sunken middle means that balance failed, but the cause is not always an opened oven door. Underbaking, a pan change, inaccurate leavening, and mixing problems can produce similar-looking depressions.

First identify the cake style. A slight settling in a flourless chocolate cake may be expected, while a wet crater in a butter layer cake is not. Compare the result with the recipe's intended texture before treating every dip as a fault.

Check the center, not just the edges

The center is the last part of a conventional layer cake to set. Golden edges and a fragrant kitchen are not enough to establish doneness.

Near the end of the stated baking window, inspect the middle. It should no longer ripple like liquid when the pan is moved gently. For cakes that use a spring-back test, a light touch should recover rather than leave a wet indentation.

Insert a tester into the actual center, avoiding a chocolate chip or fruit pocket. Follow the recipe's expected result: moist crumbs can be appropriate, but liquid batter is not. Different cakes need different tests, so do not demand a completely clean skewer from every fudgy dessert.

If the cake is visibly underbaked while still hot, return it to the oven promptly. Shield an already browned top if necessary. Once it has cooled and collapsed, reheating will not reliably reconstruct the original crumb.

Confirm the pan and oven setup

A smaller-diameter pan makes the batter deeper. The edges may finish while the center still needs substantial time. Check both diameter and depth against the recipe, and do not put a full batch into a smaller pan simply because it fits below the rim.

Dark metal and glass can alter the way the edges heat compared with a light metal cake pan. When changing material, follow recipe or manufacturer guidance and begin checking carefully rather than assuming the original timing will hold.

Use the specified oven mode. Convection and conventional heat are not automatically interchangeable. Preheat fully and use an oven thermometer to investigate a repeated mismatch between the setting and the observed bake.

Avoid opening the door during the early rise. Later, a brief, necessary doneness check is not inherently disastrous. Repeated long openings are more concerning because they disturb the baking temperature while the center is still fragile.

Measure leavening exactly

More baking powder does not produce unlimited height. Excess gas can stretch a cake beyond what its setting structure can support. Measure with level spoons and verify whether the recipe calls for teaspoons or tablespoons.

Baking soda and baking powder are not direct substitutes. Soda depends on the formula's acidity, and replacing one with the other changes more than the amount of lift.

Excess leavening and excessive aeration can cause a cake to rise and then fall; King Arthur's discussion of collapsed cake structure describes both mechanisms. If the cake ballooned dramatically before sinking, check these details before simply extending the next bake.

Match the mixing method

For a creamed butter cake, use softened butter with the consistency the recipe describes. Very warm, greasy butter cannot retain air like properly softened butter. Beat to the stated appearance rather than leaving the mixer running indefinitely.

Add eggs as directed and scrape the bowl. An uneven mixture can leave sections with different proportions of fat, liquid, and flour.

Once flour is added, follow the recipe's speed and duration. Avoid both prolonged beating and leaving dry pockets. Reverse-creamed cakes may require a deliberate mixing period to develop their intended structure, so a blanket instruction to barely stir every cake is unhelpful.

Foam cakes depend heavily on correctly whipped eggs and careful folding. Many angel food and chiffon cakes also require inverted cooling in a suitable pan. Cooling them upright can cause shrinkage that would not be diagnosed the same way in a butter cake.

Recheck substitutions before retrying

Extra liquid, an unmeasured addition of fruit puree, or substantial sugar changes can alter how the center sets. Return to the original formula before troubleshooting an oven that may be working normally.

At high elevation, seek altitude-specific guidance; faster expansion and moisture loss can require coordinated adjustments. Randomly adding flour is not a complete solution.

Let a fully baked cake cool before deciding how to serve it. A shallow, cosmetic dip can be leveled or covered with frosting. Do not disguise a raw center beneath a filling. Record the center test and any substitutions so the next bake addresses the actual failure.