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.

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• IPA^(key): /ˈpiːsə(v)ˈkeɪk/

piece of cake (plural pieces of cake)

1. Used other than with a figurative or idiomatic meaning: see piece,‎ cake.
2. (idiomatic) A job, task or other activity that is pleasant – or, by extension, easy or simple.

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

• (an activity that is easy): breeze, cakewalk, child's play, cinch, doddle, duck soup, walk in the park, walkover
• See also Thesaurus:easy thing