Croque Monsieur

Pre-heat the oven on a high heat. Grate the gruyere cheese and the parmesan. In a bowl, mix the yolks with the parmesan and cream, seasoning with ground pepper. Spread butter on one slice of bread and place it butter side down over a baking tray. Layer the grated gruyère, one slice of ham, than repeat it once more. Spread the creamy mixture on both sides of the remaining slice of bread. Take the sandwich to the oven and bake it until golden. You can also turn on the grill to accelerate this process. To make a Croque Madame, top the finished sandwich with a fried egg.