Preheat oven to 350 degrees. Clean mushrooms with damp paper towels. Carefully separate stems from caps. Chop 1/4 c of stems.
In small bowl, combine olive oil & Worcestershire. Pour over mushrooms & set aside. In large skillet over medium heat, melt butter. Add onions, green onions, chopped mushroom stems & celery. Cook & stir until tender, 3-5 minutes.
Add garlic, cook another 3 minutes. Add crab meat, creole seasoning, lemon zest & parsley, blend well. Season to taste with Salt & Pepper.
Remove from heat & stir in beaten egg & bread crumbs. Transfer mushrooms to a large baking dish. Spoon generous amounts of stuffing into each mushroom cap. Drizzle olive oil on top.
Bake uncovered, until mushrooms are tender & filling is golden brown, 15-20 minutes.