What is an idiom for macaroni and cheese?

There isn't a commonly used idiom specifically for macaroni and cheese. However, there are a few phrases you could use that capture the essence of the dish:

* Comfort food: Macaroni and cheese is often seen as a warm, comforting dish.

* Childhood favorite: Many people have fond memories of eating macaroni and cheese growing up.

* The ultimate cheesy goodness: This emphasizes the delicious, cheesy nature of the dish.

Ultimately, the best way to describe macaroni and cheese is simply to say "macaroni and cheese"! It's a beloved dish that doesn't really need an idiom to capture its essence.