May not be what you’re looking for, but I really like the burger at Selah Tea in downtown Waterville. Don’t think they do fries, they have chips and a pickle, pasta, and other sides though. That said, pretzel bun and toppings are delicious. Not very greasy either, just a delicious burger.

https://selahteacafe.com/online-ordering/ols/products/selah-turkey

Edit: Huh, based on the URL it might be Turkey, actually!? I’m amazed honestly. It’s my go to when I’m in town there, and I’d rank it up there with some of the best burgers I’ve gotten. It’s definitely worth the try, even if it’s not your traditional beef burger and fries that you may have been seeking.