That’s actually better than I expected, but yeah, I’m guessing that was the issue.
Now, a pressure sensor and microcontroller would be pennies at scale, and most toasters already use solenoids. I’m less sure about the temperature sensor because of how much heat it would have to tolerate, but I doubt it would be more than a few dollars, and manufacturing a slightly different board would be a one-time cost.
This would make a pretty good startup. The YouTube videos have done some of the marketing already, even.