Longer prove?
Alternatively put the oven on the lowest setting for 10 mins to warm up a bit, turn oven off (important step here), and prove bread in warm-ish oven.
Obviously this method is not without some risk if you get it wrong.
Tried oven with the light on to try and create some kind of ambient heat, but mixed results.
@cmburns started
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Longer prove?
Alternatively put the oven on the lowest setting for 10 mins to warm up a bit, turn oven off (important step here), and prove bread in warm-ish oven.
Obviously this method is not without some risk if you get it wrong.