Wash eggplant thoroughly; cook in boiling water to cover 10 minutes or until tender but firm. Drain and cool slightly. Cut each in half lengthwise; remove and reserve pulp, leaving a firm shell.
Cook bacon in a large skillet until crisp; drain bacon well, reserving drippings in skillet. Crumble bacon, and set aside.
Sauté onion, green pepper, and garlic in reserved drippings until tender. Add ground beef and Worcestershire sauce; cook an additional 3 minutes or until beef is browned. Stir in eggplant pulp, bacon, parsley, bread pieces, salt, and pepper; cook until thoroughly heated.
Place eggplant shells in a 12- x 8- x 2-inch baking dish. Spoon eggplant mixture into shells; top with breadcrumbs and butter. Bake at 375° for 20 minutes or until lightly browned.