Heat the grill to its highest setting.
Heat the oil in an ovenproof frying pan over a medium-high heat.
Tip in the mushrooms and fry for 2 mins until mostly softened.
Stir in the ham and spinach, and cook for 1 min more until the spinach has wilted.
Season well with black pepper and a pinch of salt.
Reduce the heat and pour over the eggs.
Cook undisturbed for 3 mins until the eggs are mostly set.
Sprinkle over the cheese and put under the grill for 2 mins.
Serve hot or cold.
