そんなこと、朝飯前ですよ。の英語

It's as easy as pie.

That's a piece of pie.

It's a piece of cake.

Doing that will be a piece of cake.

It's a piece of cake!

It's a piece of cake.

It is a piece of cake.

I could do it in my sleep.

That's nothing.

《口語》 It's as easy as pie.

Nothing could be easier.

《米口語》 It's a snap.

《口語》 It's a breeze.

It's a snap once you get the hang of it.

（直訳すれば）It is a before-breakfast job―（意訳すれば）―It is an easy task―（英語風に言えば）―I make nothing of it―I make short work of it―I can do it any day.

It's too easy.

That's a very easy matter for me.

You can do it quite easily if you put your mind to it.

It is breakfast time soon.

You look happy, so bright and early.

I usually eat breakfast here.

What, no breakfast?

This will have to do for lunch.

It's time for breakfast.

I've just finished breakfast.

I've just finished eating breakfast.

I just finished breakfast.

I've just finished breakfast.

I have just finished breakfast.

Breakfast!