While no cheese sauce can get away with the "skinny" moniker, this one isn't terribly sinful because it's milk-based rather than cream based. The addition of gooey Piemontese cheese makes it silky, rich and smooth.
Tartines can be considered dressed-up, open-faced sandwiches, but I love them for their versatility and beautiful presentation. These have autumn written all over them, and the variety of mushrooms adds to the appeal.