A piece of cake is however much you want or deserve.
A piece of cake is simply called (and spelled) "a piece of cake." It may also be called "a serving of cake" or "a slice of cake."
Used a piece of cake for what reason?
It all depends on the type of cake, the icing, any filling, how big the slice is, and the flavor of the cake.
The Cake Eaters was created in 2007.
What ever colour you perceive the piece of cake to be.
A Piece of Cake - album - was created in 1996.
Piece of Cake - novel - was created in 1983.
"a piece of cake"
An example for the use of the idiom 'it's a piece of cake' is: I can run that 100 yard sprint, it'll be a piece of cake'.
Piece of Cake - novel - has 672 pages.
Piece of cake
"A piece of cake" means something is very simple for someone to do. Example: I found chemistry difficult, but for Kris, it was a piece of cake.