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Longman Dictionary of Contemporary English
sliced bread
noun
EXAMPLES FROM CORPUS
▪ Have thick crust pizza, extra potatoes, thick sliced bread or rolls with your meal.
▪ He wrote more shampoo, hairspray, deodorant and sliced bread commercials.
▪ Nina brought me a plate of smoked salmon and some sliced bread.
▪ Now, I didn't get it because I was the greatest thing since sliced bread.
▪ On a smaller plate set before Frankie was a sandwich made with thickly sliced bread, best butter and strawberry jam.
▪ White sliced bread versus wholemeal bread is a simple example of this change at work.
Wiktionary
sliced bread

n. bread from a loaf that is sold sliced into pieces of equal thickness by an automated process

Wikipedia
Sliced bread

Sliced bread is a loaf of bread that has been sliced with a machine and packaged for convenience. It was first sold in 1928, advertised as "the greatest forward step in the baking industry since bread was wrapped". This led to the popular phrase, "greatest thing since sliced bread".

Usage examples of "sliced bread".

Talking quietly, the boys stirred the pots of stew, sliced bread and cheese, gathered bowls and plates for the evening meal.

There was sliced ham with gravy, boiled potatoes, cooked carrots and sliced bread with butter.

I let her explain it all to me as she sliced bread and cheese for us.

That had been what had delayed her, and yes, the Vestrit family had fallen on hard times when a daughter of the house made coffee and sliced bread for visitors.

One centimeter is roughly the thickness of a piece of sliced bread.

A restaurant-size refrigerator was a cold vault, empty except for bottles of mineral water, odds and ends of cheese, crackers and half a loaf of sliced bread.

She took long enough to eat her vegetable soup with sliced bread and butter.