piece of cake

Attested since 1936, originally in American English.[1] Possibly from cakewalk, or the notion of facility that derives from many cakes having agreeable tastes, and hence being ‘easy’ to consume.

• IPA^(key): /ˈpiːsə(v)ˈkeɪk/

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piece of cake (plural pieces of cake)

1. (idiomatic) A job, task or other activity that is pleasant – or, by extension, easy or simple.

   Synonyms: breeze, cakewalk, child's play, cinch, doddle, duck soup, walk in the park, walkover; see also Thesaurus:easy thing

   Sure, no problem. It'll be a piece of cake.

2. Used other than figuratively or idiomatically: see piece,‎ cake.

• easy as pie