walk in the park

ちょちょいのちょい、お安いご用、朝飯前、誰でもできる簡単なこと、単純

Ex

• It’s a walk in the park for me.
• This job isn’t just a walk in the park
• Look, I’m no walk in the park.：良く聞いて、私は単純じゃないの。

Reference source

• https://eow.alc.co.jp/search?q=walk%20in%20the%20park