easy as pie

English

(simile, colloquial) Very easy.
- 1910, Zane Grey, The Young Forester:
  "Easy as pie," replied he, eagerly. […] What Dick called easy as pie was the hardest work I ever did. I lay flat on my back, bound hand and foot, and it was necessary to jerk my body along the log till my hands should be under the knife.
- 2004, Girls Aloud, Love Machine:
  Come make my dreams, honey hard as it seems, loving me is as easy as pie.

very easy

Basque: erraz-erraza
Chinese:
Mandarin: 易如反掌 (zh) (Yìrúfǎnzhǎng), 得来全不费功夫 (Dé lái quán bù fèi gōngfū)
Dutch: een fluitje van een cent
Finnish: helppoa kuin heinänteko
French: simple comme bonjour (fr)
German: kinderleicht (de)
Italian: facile come bere un bicchiere d'acqua
Macedonian: лесно ко боза (lesno ko boza, literally “as easy as boza”)
Polish: prosty jak drut (pl)
Romanian: floare la ureche
Russian: про́ще па́реной ре́пы (ru) (próšče párenoj répy, literally “easier than stewed turnip”), раз плю́нуть (ru) (raz pljúnutʹ, literally “to spit once”), как два па́льца обосса́ть (ru) (kak dva pálʹca obossátʹ, literally “like pissing on two fingers”) (vulgar)
Swedish: lätt som en plätt (sv)
Turkish: çocuk oyuncağı (tr), kopkolay