Lightly oil a shallow, oven proof dish.
Arrange the cooked slices of potato in the dish.
Beat the eggs together with some salt and pepper then pour over the potato.
Cook in the oven for 10 minutes until the egg is just starting to set.
Using the cheese, mushroom, peppers and tomato make a clowns face.
Increase the oven temperature to 200ºC, 400ºF, Gas mark 6 and cook for another 10 minutes.
Serve immediately.