Does a oven sensor exist that you can just put inside?
I’ve never seen one and google didn’t find any either, but aliexpress has these …
which I’m sure you could interface with an arduino and HA via MQTT.
This thread has some more info https://forum.arduino.cc/index.php?topic=127774.15
also here…
I am also interested in this, would be cool to see what you come up with.