Remove clams from shell and chop coarsely. Set clams and shells aside. In a medium sized heat resistant, non-metallic mixing bowl place 2 tablespoons butter. Heat in microwave oven 30 seconds or until melted.
Add onion and garlic. Heat, uncovered in microwave oven 3 energy 3 minutes or until onion is tender. Add egg, ¼ cup bread crumbs, chopped clams and oregano to onion mixture.
Spoon mixture into reserved shells. Place shells on a heat-resistant, non-metallic serving platter.
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. Heat, uncovered in microwave oven 5 minutes or until heated through.
