My two versions of this classic French café/bistro sandwich - oven baked for large quantities and ease.......or, the traditional frying pan/skillet method! You can always rely upon the French to add a certain "je ne sais quoi" to even the simplest food ...including the humble cheese and ham sandwich. The croque-monsieur (which becomes a croque-madame if you top it with a fried egg) is a great favourite in French cafés & bistros, and there are as many methods of crafting it as there are cafés! This one works for me. But, please be warned ... it's not for calorie-counters, the Cholesterol Police or those of a nervous disposition!!