1. Remove clams from half shell and chop coarsely. Set clams and shells aside. 2. In a medium-sized, heat-resistant, non-metallic mixing bowl place 2 tablespoons butter. Heat in Microwave Oven 30 seconds or until melted. 3. Add onion and garlic. Heat, uncovered, in Microwave Oven 3 energy 3 minutes or until onion is tender. Add egg, the 1/4 cup bread crumbs, chopped clams and oregano to onion mixture. 4. Spoon mixture into reserved shells. Place shells on a heat- resistant, non-metallic serving platter. 5. In a small bowl combine the 1/3 cup seasoned bread crumbs and the 2 tablespoons melted butter. Sprinkle buttered bread crumbs on top of clam mixture. 6. Heat, uncovered, in Microwave Oven 5 minutes or until heated through.