[bryanrasmussen]

I would expect it to never burn that toast.

[wlonkly]

A toaster may not burn a piece of toast or, through inaction, allow a piece of toast to be burned.

A toaster must obey the doneness setting given it by human beings except where such orders would conflict with the First Law.

A toaster must protect its own existence as long as such protection does not conflict with the First or Second Law.

[danbruc]

That would require the AI to perform at a superhuman level.

[bryanrasmussen]

that would require the 'AI' to do something that computers are really good at - detect when a particular event (perfectly toasted) has been achieved via inputs monitored at the millisecond without deviation and then change a state - toasting to not toasting - based on detecting that event.