
In bakery, the ideal temperature for proofing is between 25°C and 30°C. At this temperature, the yeast works efficiently, and the dough rises smoothly, without the risk of compromising its structure.
Unfortunately, the 40°C temperature commonly offered by oven proofer functions is too high.
It would appear that manufacturers have difficulty in maintaining very low temperatures (30°C) in their ovens.
At 40°C, the yeast can start to run out of steam, or even degrade, as it works much better in a milder temperature range, and this can affect the final texture of the dough, which will be less aerated.

But the problem doesn't stop there: for doughs containing butter, such as brioches, croissants or other viennoiseries, a temperature of 40°C can be downright embarrassing, as butter starts to melt at around 35°C. This means that at 40°C, the butter in the dough risks liquefying, compromising the flaky structure of your viennoiseries.
Instead of a homogeneous push, you could end up with a greasy dough that's difficult to handle, and a product that's ultimately less moist.

First and foremost, check your oven's proofing temperature: Put a thermometer in your cold, switched-off oven, start it up in proofing mode, and read the temperature after 15 minutes.
You may be surprised by the reading. For example, I have a good 45°C in my oven, compared with the 35°C displayed by the oven!
If the measured temperature doesn't exceed 35°C, all's well, but if it's close to 30°C, it's just fine.
In these 2 cases, you can use your oven in proofer mode.
And if not, try one of the alternatives below.
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