I've done mac & cheese- I did a copycat of LongHorn Steakhouse's "steakhouse mac n cheese" with cavatappi pasta, gruyere, white cheddar, fontina, parmesan, and bacon..

Yes, I found the recipe here:

Longhorn Steakhouse Copycat Recipes

But what they got wrong is that there's crumbled bacon throughout the pasta and the topping consists of mixed Panko crumbs & grated parmesan- it isn't just straight parmesan on top.

It's mega good. I've only made it once, though 'cuz Jay is pretty lactose intolerant and can't eat cheese. :3