easy是简单，pie是馅饼，as easy as pie的意思是“very easy”，即“非常容易，不费吹灰之力，易如反掌”。

【例句】
Finding recipes in America is as easy as pie.
在美国寻找食谱可谓易如反掌。

Once you get used to it , skiing is as easy as pie.
一旦你习惯了以后，滑雪就很简单了。