The Croque-Savoyard is what happens when the croque-monsieur is rebuilt with the cheeses of the French Alps. The Gruyère and béchamel of the standard version give way to Reblochon or Beaufort, the two cheeses that define the dairy of the Savoie. Reblochon brings a soft, washed-rind funk and melts into something closer to a sauce than a topping. Beaufort, firmer and more nutty, holds more structure under the broiler. Either way the sandwich gets heavier and more pungent than its Parisian parent, and the béchamel is often dropped entirely because the Alpine cheese is rich enough to bind the sandwich on its own.
The supporting cast follows the mountain larder. Lardons or a few slices of jambon cru replace the gentle jambon de Paris. Some versions tuck in a layer of thin-sliced potato, which pushes the sandwich most of the way toward a tartiflette pressed between bread. The bread is usually pain de mie or pain de campagne, sturdy enough to carry a cheese this assertive without going limp before it reaches the table. This is cold-weather food, ski-station food, the kind of sandwich that arrives at a mountain café alongside a glass of Apremont and is not pretending to be light.
The Croque-Savoyard sits in a tight cluster of Alpine croques that all do roughly the same thing with slightly different cheeses and additions. The Croque-Tartiflette takes the potato idea to its conclusion. The Croque-Raclette swaps in raclette for an even meltier result. All of them are regional rewrites of the same base, and the Croque-Monsieur tradition that frames them, the béchamel-and-broiler logic and its many codified variants, belongs to its own article. What the Savoyard adds to that tradition is altitude: a sandwich built for the cold, from a region that takes its cheese as seriously as Paris takes its bread.