“Piece of cake”

Entry in progress—B.P.
 
“Lasagna is one of the easiest meals to make. It’s a pizza cake” and “It’s pretty easy to make a deep dish pizza. It’s like a pizza cake” are related jokes.
   
     
Merriam-Webster Dictionary
Main Entry: piece of cake
Date: 1935
: something easily done : cinch , breeze
     
(Oxford English Dictionary)
cake, n.
Colloq. phr. a piece of cake: something easy or pleasant.
1936 O. NASH Primrose Path 172 Her picture’s in the papers now, And life’s a piece of cake.
1942 T. RATTIGAN Flare Path 1, Special. Very hush-hush. Not exactly a piece of cake, I believe.
1943 P. BRENNAN et al. Spitfires over Malta i. 31 The mass raids promised to be a piece of cake, and we anticipated taking heavy toll of the raiders.
1960 T. MCLEAN Kings of Rugby 205 They took the field against Canterbury as if the match were ‘a piece of cake’.