Preheat your oven to 375°F (190°C).
Arrange the cleaned mushroom caps, stem side up, on a baking sheet or baking dish. Lightly spray them with olive oil spray.
In a large mixing bowl, combine the softened cream cheese, breadcrumbs, garlic, Worcestershire sauce, green onions, Parmesan cheese, and chopped parsley. Fold in the crab meat and season generously with salt and pepper.
Spoon about 1 1/2 tablespoons of the creamy crab mixture into each mushroom cap, pressing it in slightly. Bake for about 20 minutes, or until the mushrooms are tender and the filling is heated through.
For a crispy golden finish, switch on the broiler during the last minute of cooking. Keep a close eye, as broilers can be unpredictable, and you want the tops lightly browned.