Preheat the oven broiler to high. Line a baking sheet with aluminum foil.
Coat the mushroom caps with olive oil on both sides. Sprinkle with half the salt, half the pepper, and half the garlic powder. Broil 5 minutes on each side, or until just tender.
Remove mushrooms from oven and drain off any liquid. Change the oven temperature to 400 degrees.
Break an egg into each mushroom and top with parmesan cheese. Bake 15 minutes, until egg whites are cooked.
Season with remaining salt, pepper, and garlic powder. Top with the parsley. Serve and enjoy!