8 large baking potatoes2 tablespoons margarine2 cans (7-oz size) tuna, drained1 tablespoon grated onion1 tablespoon chopped parsley1 can (10¾ oz) condensed Cheddar cheese soup, undiluted¼ teaspoon paprika2 drops Tabasco¼ teaspoon salt4 slices processed American cheese, halved Makes 8 servings.