Noun
sliced bread (usually uncountable, plural sliced breads)
Bread from a loaf that is sold sliced into pieces of equal thickness by an automated process.
Synonym: (US) sandwich bread
The greatest thing since sliced bread. George Jones
I guess I was a mom so late in life, my daughter was the greatest thing since sliced bread. Candice Bergen
John Carey, who had once buried The Metropolitan Critic, hailed Unreliable Memoirs as the written equivalent of sliced bread. Instantly I revised my opinion of his critical prowess upwards. Clive James
I left school with no qualifications, but I was doing theatre and film work and thought that was the best thing since sliced bread. Dexter Fletcher