Classic Croque Monsieur
Two slices of white bread
One slice of cured or roast ham
Sliced or grated Gruyere cheese
My oven has a toastie setting but this can be done with bread that's been lightly toasted, then filled with ham and mustard, the cheese placed on the top slice and then the toastie reheated in the oven until the cheese bubbles.
For Croque Madame, add a fried or poached egg onto the top when serving.
Place a ring of pineapple onto the ham and sprinkle with cinnamon, then continue as before.