A cake sinking in the middle usually means something went a little off during baking. Here are the most common reasons:
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Underbaked – The center wasn't fully set before removing from the oven.
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Too much leavening – Excess baking powder or soda can cause it to rise fast, then collapse.
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Overmixed batter – This can deflate air bubbles and mess with structure.
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Oven door opened too soon – That rush of cool air can stop the cake from setting properly.
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Wrong oven temp – Too low and it rises slowly, too high and it sets unevenly.
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