In a large skillet, melt the butter over medium heat. Add the onion, bell pepper, and celery, and cook until soft and translucent.
Stir in the parsley and garlic, and cook for 2 more minutes. Set aside to cool.
Peel the crabs and gather about 1½ pounds of crab meat (both lump and claw). Save 8 crab shells for stuffing.
Preheat the oven to 350°F.
Once the skillet mixture has cooled, gently fold in the crab meat.
Add mayonnaise, beaten egg, lemon juice, Worcestershire sauce, hot sauce, Creole seasoning, crushed crackers, and Old Bay seasoning. Mix gently to keep the crab meat chunky.
Stir in the parmesan cheese and sliced green onions, tossing gently.
Clean the reserved crab shells, then fill each shell with the crab mixture, mounding it up. Sprinkle extra crushed crackers and a small slice of butter on top, and dust with paprika.
Place on a baking sheet and bake for 30 minutes, uncovered. Serve hot and enjoy!