easy as pie
Also, easy as falling or rolling off a log. Capable of being accomplished with no difficulty, as in This crossword puzzle is easy as pie. The first term presumably alludes to consuming pie (since making pie requires both effort and expertise). The variants most likely allude to standing on a log that is moving downstream, a feat in which falling off is a lot easier than remaining upright. Mark Twain had it in A Connecticut Yankee in King Arthur's Court (1889): “I could do it as easy as rolling off a log.” The first colloquial term dates from the early 1900s, the colloquial variants from the 1830s. For a synonym, see piece of cake.
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Example sentences from the Web for easy as pie
Talking about death is never easy, but with food, comfort, and familiarity, a new kind of dinner party is making it easier.
The first thing they told us was that the traffickers are now using Turkish ports, which are relatively easy to reach from Syria.
You know, when I was younger, I used to make problems for myself, like it was too easy.The Story Behind Lee Marvin’s Liberty Valance Smile|Robert Ward|January 3, 2015|DAILY BEAST
They selected an “easy mark” who turned out to be an off-duty NYC Housing Authority cop named James Carragher.His First Day Out Of Jail After 40 Years: Adjusting To Life Outside|Justin Rohrlich|January 3, 2015|DAILY BEAST
The process of co-opting black music and selling it back to the adoring public in whiteface is as American as apple pie.
A constant sense of easy balance should be developed through poising exercises.Expressive Voice Culture|Jessie Eldridge Southwick
Big Reginald took their lives at pool, and pocketed their half-crowns in an easy genial way, which almost made losing a pleasure.The Pit Town Coronet, Volume I (of 3)|Charles James Wills
The first jolt had like to have shaken me out of my hammock, but afterwards the motion was easy enough.Gulliver's Travels|Jonathan Swift
His Indian repute had not preceded him to such degree as to make the way easy for him through the London crowd.Kipling Stories and Poems Every Child Should Know, Book II|Rudyard Kipling
The endless miles of railways, the vast apparatus of the factories, the soaring structures of the cities bear easy witness to it.The Unsolved Riddle of Social Justice|Stephen Leacock