a piece of cake - An easy task that’s so fun, it’s like getting free candy and

An easy task that’s so fun, it’s like getting free candy and a compliment from your crush.

That test was a piece of cake. I aced it and still had time to play video games.

This assignment was a piece of cake. I did it in five minutes and still had time to eat.

That quiz was a piece of cake. I finished it before my coffee even got hot.