A sunken cake is almost always one of five things. All five are fixable.

What's Inside

A cake that domes then collapses has a structural problem, not a flavour problem. Work through these five causes in order.

1. Underbaked in the Centre

The most common cause. A skewer test is more reliable than a timer: insert it in the centre, not the edge. It should come out with a few moist crumbs, not wet batter.

Fix: add five minutes and retest. If the top is already dark, tent it with foil.

2. Overmixed Batter

Mixing develops gluten. Past the point where the flour is just incorporated, you are building a rubber band that stretches during rise and then contracts while cooling.

Fix: mix until the last streak of flour disappears and stop. With an electric mixer, use the lowest speed for the final addition.

3. Too Much Leavening

Excess baking powder makes the cake rise fast and collapse fast. It is a specific failure mode: a high dome at twenty minutes, a crater at forty.

Fix: measure leavening by weight, not by spoon. And check whether your baking powder is still active — a half-teaspoon in hot water should fizz immediately.

4. Oven Temperature Is Wrong

An oven that runs 25°C hot sets the outside before the middle has risen. An oven that runs cold lets the structure collapse before it sets.

Fix: buy an oven thermometer. It costs very little and resolves more baking failures than any other purchase.

5. Opening the Door Too Early

Before the structure sets — roughly the first two-thirds of the bake — a door opening drops the temperature sharply and can cause a collapse.

Fix: use the oven light and the window. Wait until the last quarter of the bake time to check.

Quick Diagnostic

  • Sunken in the centre with a wet middle: underbaked
  • Sunken with a tough, chewy crumb: overmixed
  • Rose high then collapsed hard: too much leavening, or the door was opened
  • Cracked top and dry edges: oven too hot
  • Flat and dense throughout: leavening is dead, or the butter and sugar were under-creamed

Verdict

Check your oven temperature first, then your measuring. Those two fix most sunken cakes, and neither requires changing your recipe.

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