Did that with cookies once. A whole series of mistakes during the process and fixes to recover from those mistakes resulted in a batch of perfectly undercooked and absolutely delicious cookies that I've never forgotten... and also never managed to replicate.

Fucking hell I share the same experience. I made an apple pie with buttery dough, the crust was just perfect. Have tried to replicate it ever since, not once it came even close. Same ingredients, same ratios, I am not sure what am I missing, maybe the temperature fluctuated just right, I can't tell... maybe the apple juices were just right, so many factors...

I did the same with a sandwich once. 10 years later, I think about this sandwich. Toasted Reuben on sourdough. Never could get it the same again.