Which is why this video might irk the French even more than our normal content. Sticking croque monsieur flavours on a crumpet?!
Preheat the oven to 180°C. Take the crumpets and build them up, layering cheese, ham and mustard between them, to make a sort of crumpet tower.
Insert the tower into a loaf tin, squashing in a few more if needs be. Pour the bechamel over the top and sprinkle with finely grated comte. Bake until the cheese is golden and bubbling.