The Silly Mistake That's Making Your Popovers Turn Out Flat - Tasting Table
Briefly

Popover preparation requires a precise baking technique, primarily ensuring the oven is adequately preheated. A hot oven creates a necessary steam reaction, allowing the batter’s moisture to generate puffs. Skipping adequate preheating can lead to flat and dense popovers. Expert bakers recommend a minimum of 15 minutes of preheating time and suggest using an oven thermometer for accuracy. Without a strong oven temperature, the signature rise and texture of popovers remain unattainable, as they rely solely on heat for their fluffy nature.
"Making sure your oven is really hot is the best tip. I'd recommend letting it stay preheated for at least 15 minutes before baking to ensure it will hold its temperature well."
"Popovers are put into a very hot oven to achieve a strong oven spring, causing them to 'pop over' the edges of the pan."
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