You can make this dish in one casserole dish.

1 lb. brown Crimini (Baby Bella) mushrooms, washed and thickly sliced 1 T olive oil salt and fresh ground black pepper to taste 4 eggs 2-3 tsp. freshly grated Parmesan 2-3 tsp finely chopped parsley for garnish (optional) freshly made whole wheat toast for serving with the eggs (optional)

Preheat oven or toaster oven to 400F/200C. Spray 2 individual baking dishes or a flat casserole dish with non-stick spray. Wash mushrooms and spin dry or dry with paper towels. Slice mushrooms into slices about 1/2 inch thick. Heat oil in a large frying pan over high heat and saute mushrooms until they have released all their liquid and the liquid has evaporated, about 6-8 minutes. Season mushrooms with a little salt and fresh ground black pepper and quickly transfer to baking dishes. Break two eggs over the mushrooms in each individual dish (or four eggs over all the mushrooms in a casserole dish.) If you're not that experienced at breaking eggs, you can break each one into a small bowl and then gently pour it over the mushrooms. (If you don't mind dirtying extra dishes, it would be nice to have each egg broken into a small dish so you can put them over the mushrooms as quickly as possible.) Season eggs with a little salt and fresh ground black pepper to taste and sprinkle a little Parmesan over them. Bake eggs until they are done to your liking, about 10 minutes for firm whites and partly-soft yolks. If you want toast, make it while the eggs are baking. Serve hot, with toast if desired.