“Piece of cake” means something easy. There’s a pun:
“I took a baking class. The final was a piece of cake.”
“Time for my Baking class mid term. Should be a piece of cake” was cited on Twitter on November 2, 2009. “I just took a Baking Class. The final was a piece of cake” was posted on Reddit on June 14, 2016.
Twitter
Manuel Garcia
@mannyquin
Time for my Baking class mid term. Should be a piece of cake ;]
7:54 PM - 2 Nov 2009
Twitter
Kayla
@KayBuuh
Tech exam tomorrow. This should be a piece of cake...literally! Hahaha get it? I go to tech for a baking class! Its a pun! 
9:30 PM - 16 Dec 2009
Twitter
Johnny Banger
@CrispyJacks
I wonder if exams for baking class are a piece of cake?
3:04 PM - 5 Jan 2012
Twitter
Richard Powell
@rapowell90
@DwightAKAJP2 i took a baking class once. My only assignment was a piece of cake
2:55 PM - 27 Apr 2013
reddit
I just took a Baking Class
submitted June 14, 2016 by trenton012001
The final was a piece of cake.
Above, a 1934 plaque from the Big Apple Night Club at West 135th Street and Seventh Avenue in Harlem. Discarded as trash in 2006. Now a Popeyes fast food restaurant on Google Maps.
Recent entries:
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“I prefer my guns the way Democrats prefer their voters..undocumented and untraceable” (3/21)
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“Using cash is like telling the government what you buy is none of their fucking business” (3/21)
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“Men who say women belong in the kitchen obviously don’t know what to do with them in the bedroom” (3/21)
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“You don’t have a valentine for Valentine’s Day? I don’t have a groundhog for Groundhog Day” (3/21)
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“If the government cannot protect the vote, the border or its citizens, the why do we have one?” (3/21)
More new entries...
Above, Big Apple Corner at 54th Street and Broadway in Manhattan. Google Maps.
Above, John J. Fitz Gerald, from the Aug. 15, 1931, Binghamton (NY) Press, pg. 14.
Listen to Robert Emmerich introduce "The Big Apple," a hit song from 1937. Music written by Bob and performed by Tommy Dorsey's Clambake Seven with Bob on piano. Lyrics written by Buddy Bernier and sung by Edythe Wright. Audio provided by Dorothy Emmerich.
Also listen to a 1937 "The Big Apple" song by Ozzie Nelson and his Orchestra. See a 1929 photo of John J. Fitz Gerald and a 1931 photo of John J. Fitz Gerald.
This site is edited by Barry Popik.