Final answer:
The Beatles song with the original working title of "Scrambled Eggs" is "Yesterday".
Step-by-step explanation:
The Beatles song with lyrics that were originally just "scrambled eggs" is "Yesterday". The song was initially composed by Paul McCartney, and the working title of the song was "Scrambled Eggs", with the melody and most of the lyrics being created around this phrase. Eventually, the lyrics were changed to the familiar words we know today.