firstly, a subject line that lists the subject is key to getting help.
second. I cook hot dogs, and eggs, both about 8 minutes. pancakes about 30 minutes if I make a lot. sauce can take a couple hours.
the timer for each food would make sense.
let me rant a bit. we use a toaster oven. when cooking toast, the heater comes on and off to maintain temperature. what bothers me is when I come to the toaster as it is done and the heatin elements are red hot indicating it was heating at the last second. the retained heat should have been enough for those last few seconds. I think that the internal timer should know that under 30 secnds and the element will not come on. this would save a lot of electricity.
rant #2 my main stove has a red light that comes on when the burners are hot. this light is based on some temperature sensor and shows if any burner is hot. I would like this to also turn on the light above the stove. this way, the light is on and the red light are on. more indication that the store is hot.
thanks for letting me rant.
back to the subject. IF the heating elements are electric and IF they are switched by solid state relays, you could add a control circuit.
if you have a gas stove and want to add a motorized device to shut off the gas, I would make sure the device is rated for such a use. also, lots of testing in the lab. the device should have a clutch so that manual operation can close the valve at any time.
AND the operation should not require any training. the one time visitor must be able to turn the stove off without thinking.