Heat a BBQ or grill pan.
Peel or brush the mushrooms and carefully remove the stalks.
Brush each side of the mushroom with olive oil and place them onto the grill pan for a couple of minutes.
Crack an egg into each mushroom; cover the BBQ or place a cover over the grill pan and leave to cook for between 5 - 8 minutes depending on the size of the mushroom..
While the eggs are cooking, wilt the English spinach in a pan
Serve the eggs on a bed of spinach with grated Parmesan and cracked black pepper.