Umami Cafe in Croton has Truffled Mac and Cheese on their appetizer menu. My wife and daughter always enjoyed it. Here’s the description from the menu - “Pasta, Gruyere & Fontina cheese sauce, truffle oil, bread crumbs”.
On a related note, according to their FB page they’ve been sold and are under new management. They’re now open for lunch Thursday-Sunday but no longer seem to do half price appetizers on Thursdays. They also have a largely revised menu. I still miss the half duck they used to do.